Table of Contents
ASUS PRIME B250M-K User Manual
Displayed below is the user manual for PRIME B250M-K by ASUS which is a product in the Motherboards category. This manual has pages.
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Motherboard
PRIME B250M-K
ii
E12112
First Edition
October 2016
Copyright © 2016 ASUSTeK COMPUTER INC. All Rights Reserved.
No part of this manual, including the products and software described in it, may be reproduced,
transmitted, transcribed, stored in a retrieval system, or translated into any language in any form or by any
means, except documentation kept by the purchaser for backup purposes, without the express written
permission of ASUSTeK COMPUTER INC. (“ASUS”).
Product warranty or service will not be extended if: (1) the product is repaired, modied or altered, unless
such repair, modication of alteration is authorized in writing by ASUS; or (2) the serial number of the
product is defaced or missing.
ASUS PROVIDES THIS MANUAL “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OR CONDITIONS OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL ASUS, ITS
DIRECTORS, OFFICERS, EMPLOYEES OR AGENTS BE LIABLE FOR ANY INDIRECT, SPECIAL,
INCIDENTAL, OR CONSEQUENTIAL DAMAGES (INCLUDING DAMAGES FOR LOSS OF PROFITS,
LOSS OF BUSINESS, LOSS OF USE OR DATA, INTERRUPTION OF BUSINESS AND THE LIKE),
EVEN IF ASUS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES ARISING FROM ANY
DEFECT OR ERROR IN THIS MANUAL OR PRODUCT.
SPECIFICATIONS AND INFORMATION CONTAINED IN THIS MANUAL ARE FURNISHED FOR
INFORMATIONAL USE ONLY, AND ARE SUBJECT TO CHANGE AT ANY TIME WITHOUT NOTICE,
AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY ASUS. ASUS ASSUMES NO
RESPONSIBILITY OR LIABILITY FOR ANY ERRORS OR INACCURACIES THAT MAY APPEAR IN THIS
MANUAL, INCLUDING THE PRODUCTS AND SOFTWARE DESCRIBED IN IT.
Products and corporate names appearing in this manual may or may not be registered trademarks or
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Offer to Provide Source Code of Certain Software
This product contains copyrighted software that is licensed under the General Public License (“GPL”),
under the Lesser General Public License Version (“LGPL”) and/or other Free Open Source Software
Licenses. Such software in this product is distributed without any warranty to the extent permitted by the
applicable law. Copies of these licenses are included in this product.
Where the applicable license entitles you to the source code of such software and/or other additional data,
you may obtain it for a period of three years after our last shipment of the product, either
(1) for free by downloading it from http://support.asus.com/download
or
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In your request please provide the name, model number and version, as stated in the About Box of the
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This offer is valid to anyone in receipt of this information.
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archives, etc. to this email address).
iii
Contents
Safety information ...................................................................................... iv
About this guide ......................................................................................... iv
Package contents ....................................................................................... vi
PRIME B250M-K specications summary ................................................ vi
Chapter 1 Product introduction
Motherboard overview ............................................................................. 1-1
Central Processing Unit (CPU) ................................................................ 1-7
System memory ........................................................................................ 1-8
Chapter 2 BIOS information
BIOS setup program ................................................................................. 2-1
EZ Mode ..................................................................................................... 2-2
Advanced Mode ........................................................................................ 2-3
Exit menu ................................................................................................... 2-4
Appendix
Notices .......................................................................................................A-1
ASUS contact information .......................................................................A-5
iv
Safety information
Electrical safety
• To prevent electrical shock hazard, disconnect the power cable from the electrical outlet
before relocating the system.
• When adding or removing devices to or from the system, ensure that the power cables
for the devices are unplugged before the signal cables are connected. If possible,
disconnect all power cables from the existing system before you add a device.
• Before connecting or removing signal cables from the motherboard, ensure that all
power cables are unplugged.
• Seek professional assistance before using an adapter or extension cord. These devices
could interrupt the grounding circuit.
• Ensure that your power supply is set to the correct voltage in your area. If you are not
sure about the voltage of the electrical outlet you are using, contact your local power
company.
• If the power supply is broken, do not try to x it by yourself. Contact a qualied service
technician or your retailer.
Operation safety
• Before installing the motherboard and adding components, carefully read all the manuals
that came with the package.
• Before using the product, ensure all cables are correctly connected and the power
cables are not damaged. If you detect any damage, contact your dealer immediately.
• To avoid short circuits, keep paper clips, screws, and staples away from connectors,
slots, sockets and circuitry.
• Avoid dust, humidity, and temperature extremes. Do not place the product in any area
where it may be exposed to moisture.
• Place the product on a stable surface.
• If you encounter technical problems with the product, contact a qualied service
technician or your retailer.
About this guide
This user guide contains the information you need when installing and conguring the
motherboard.
How this guide is organized
This guide contains the following parts:
• Chapter 1: Product introduction
This chapter describes the features of the motherboard and the new technology it
supports. It includes descriptions of the switches, jumpers, and connectors on the
motherboard.
• Chapter 2: BIOS information
This chapter discusses changing system settings through the BIOS Setup menus.
Detailed descriptions for the BIOS parameters are also provided.
v
Where to nd more information
Refer to the following sources for additional information and for product and software
updates.
1. ASUS websites
The ASUS website provides updated information on ASUS hardware and software
products. Refer to the ASUS contact information.
2. Optional documentation
Your product package may include optional documentation, such as warranty yers,
that may have been added by your dealer. These documents are not part of the
standard package.
Conventions used in this guide
To ensure that you perform certain tasks properly, take note of the following symbols used
throughout this manual.
DANGER/WARNING: Information to prevent injury to yourself when
completing a task.
CAUTION: Information to prevent damage to the components when
completing a task
IMPORTANT: Instructions that you MUST follow to complete a task.
NOTE: Tips and additional information to help you complete a task.
Typography
Bold text Indicates a menu or an item to select.
Italics
Used to emphasize a word or a phrase.
<Key> Keys enclosed in the less-than and greater-than sign
means that you must press the enclosed key.
Example: <Enter> means that you must press the Enter or
Return key.
<Key1> + <Key2> + <Key3> If you must press two or more keys simultaneously, the key
names are linked with a plus sign (+).
vi
PRIME B250M-K specications summary
(continued on the next page)
Package contents
Check your motherboard package for the following items.
Motherboard ASUS PRIME B250M-K motherboard
Cables 2 x Serial ATA 6.0 Gb/s cables
Accessories 1 x ASUS I/O Shield
1 x M.2 Screw
Application DVD Support DVD
Documentation User Guide
If any of the above items is damaged or missing, contact your retailer.
CPU
LGA1151 socket for Intel® 7th/6th Generation Core™ i7 / i5 / i3, Pentium®, and
Celeron® processors
Supports Intel® 14nm CPU
Supports Intel® Turbo Boost Technology 2.0*
* The Intel® Turbo Boost Technology 2.0 support depends on the CPU types.
** Refer to www.asus.com for Intel® CPU support list.
Chipset Intel® B250 Chipset
Memory
2 x DIMMs, max. 32GB, DDR4 2400*/2133** MHz, non-ECC, un-buffered memory
Dual-channel memory architecture
Supports Intel® Extreme Memory Prole (XMP)
* Due to Intel® chipset limitation, DDR4 2400MHz memory frequency is only supported by 7th
Generation Intel® processors. Higher memory modules will run at the maximum transfer rate
of DDR4 2400MHz.
** Due to Intel® chipset limitation, DDR4 2133MHz and higher memory modules on 6th
Generation Intel® processors will run at the maximum transfer rate of DDR4 2133MHz.
*** Refer to www.asus.com for the Memory QVL (Qualied Vendors List).
Expansion
slots
1 x PCI Express 3.0/2.0 x16 slot (at x16 mode)
2 x PCI Express 3.0/2.0 x1 slots
Graphics
Integrated graphics processor - Intel® HD Graphics support
Multi-VGA output support: DVI-D/D-Sub port
- Supports DVI-D with maximum resolution of 1920 x 1200 @60Hz
- Supports D-Sub with maximum resolution of 1920 x 1200 @60Hz
Supports Intel® InTru™ 3D/Quick Sync Video/Clear Video HD Technology/Insider™
Storage
Intel® B250 Chipset:
- 1 x M.2 Socket 3 with M Key, type 2242/2260/2280 storage devices support
(SATA mode & x4 PCIE mode)*
- 6 x SATA 6.0 Gb/s ports (gray)
* When a device in SATA mode is installed on the M.2 socket,SATA_1 port cannot be used.
LAN Realtek® RTL8111H Gigabit LAN supports LANGuard
USB
Intel® B250 Chipset:
- 6 x USB 3.0/2.0 ports (2 ports at mid-board; 4 ports at back panel, blue, Type A)
- 6 x USB 2.0/1.1 ports (4 ports at mid-board; 2 ports at back panel)
vii
PRIME B250M-K specications summary
(continued on the next page)
Audio
Realtek® ALC887 8-channel High Denition Audio CODEC
- LED-illuminated design: Brighten up your build with the gorgeous illuminated audio
trace path.
- Audio Shielding: Ensures precision analog/digital separation and greatly reduces
multi-lateral interference.
- Dedicated audio PCB layers: Separate layers for left and right channels to guard the
quality of the sensitive audio signals.
- Premium Japanese audio capacitors: Provide warm, natural and immersive sound
with exceptional clarity and delity.
- Supports jack-detection and front panel jack-retasking.
ASUS
special
features
ASUS 5X PROTECTION III
- ASUS SafeSlot Core: Fortied PCIe Slot prevents damage
- ASUS LANGuard - Protects against LAN surges, lightning strikes and static
electricity discharges!
- ASUS Overvoltage Protection - World-class circuit-protecting power design
- ASUS DIGI+ VRM - 5 phase digital power design
- ASUS Stainless Steel Back I/O - 3x corrosion-resistance for greater durability!
Superb Performance
M.2 onboard
- The latest transfer technologies with up to 32Gb/s data transfer speeds
ASUS EPU
- EPU
UEFI BIOS
- Most advanced options with fast response time
Gaming Scenario
Audio features
- Audio that roars on the battleeld
ASUS Exclusive Features
- ASUS AI Charger
- ASUS AI Suite 3
EZ DIY
UEFI BIOS EZ Mode
- Featuring friendly graphics user interface
- ASUS CrashFree BIOS 3
- ASUS EZ Flash 3
Q-Design
- ASUS Q-DIMM
ASUS
quiet
thermal
solution
Quiet Thermal Design
- ASUS Fan Xpert
- Stylish Fanless Design: PCH heatsink solution
viii
PRIME B250M-K specications summary
Specications are subject to change without notice.
Rear panel I/O
ports
1 x PS/2 keyboard port
1 x PS/2 mouse port
4 x USB 3.0/2.0 ports (blue, Type A)
2 x USB 2.0/1.1 ports
1 x D-Sub port
1 x DVI port
1 x LAN (RJ-45) port
3 x Audio jacks support 8-channel audio output*
* Use a chassis with HD audio module in the front panel to support an 8-channel audio
output.
Internal
connectors
1 x USB 3.0/2.0 connector supports additional 2 USB 3.0/2.0 ports (19-pin)
2 x USB 2.0/1.1 connectors support additional 4 USB 2.0/1.1 ports
6 x SATA 6.0Gb/s connectors (gray)
1 x M.2 Socket3 (for M Key)
1 x CPU Fan connector (PWM mode only)
1 x 4-pin Chassis Fan connector for both 3-pin(DC mode) and 4-pin(PWM mode)
coolers control
1 x Front panel audio connector
1 x COM header
1 x S/PDIF Out connector
1 x 24-pin EATX Power connector
1 x 4-pin ATX 12V Power connector
1 x Clear CMOS header
1 x Speaker connector
1 x System panel connector
BIOS features
128 Mb Flash ROM, UEFI AMI BIOS, PnP, DMI3.0, WfM2.0, SM BIOS 3.0, ACPI
6.1, Multi-language BIOS, ASUS EZ Flash 3, CrashFree BIOS 3, F6 Qfan
Control, F3 My Favorites, Last Modied log, F12 PrintScreen, and ASUS
DRAM SPD (Serial Presence Detect) memory information
Manageability WfM 2.0, DMI 3.0, WOL by PME, PXE
Support DVD
Drivers
ASUS utilities
EZ Update
Anti-virus software (OEM version)
OS support
Windows® 10 (64-bit)
Windows® 8.1 (64-bit)*
Windows® 7 (64-bit/32-bit)*
* Windows® 8.1 (64-bit) and Windows® 7 (32/64-bit) are only supported when using 6th
Generation Intel® Processors.
Form factor uATX form factor: 8.9 in. x 7.3 in. (22.6 cm x 18.5 cm)
ASUS PRIME B250M-K 1-1
Product introduction
1
Motherboard overview
• Unplugthepowercordfromthewallsocketbeforetouchinganycomponent.
• Beforehandlingcomponents,useagroundedwriststraportouchasafelygrounded
objectorametalobject,suchasthepowersupplycase,toavoiddamagingthemdue
tostaticelectricity.
• Beforeyouinstallorremoveanycomponent,ensurethattheATXpowersupplyis
switchedofforthepowercordisdetachedfromthepowersupply.Failuretodoso
maycauseseveredamagetothemotherboard,peripherals,orcomponents.
• Unplugthepowercordbeforeinstallingorremovingthemotherboard.Failuretodoso
cancauseyouphysicalinjuryanddamagetomotherboardcomponents.
Place this
side towards
the rear of the
chassis
PRIME B250M-K
PCIE SATA
M.2
IRST
X4 V X
PCIEX16
PCIEX1_1
PCIEX1_2
SPEAKER
CLRTC F_PANEL
SPDIF_OUT
USB1112USB910 USB3_12
AAFP COM
ATX12V
EATXPWR
CPU_FAN
CHA_FAN
BATTERY
Super
I/O
ALC
887
Realtek
8111H
RTD
2166
DIGI
+VRM
22.6cm(8.9in)
LGA1151
Intel®
B250
2280 2260 2242
M.2 (SOCKET3)
DDR4 DIMM_B1 (64bit, 288-pin module)
DDR4 DIMM_A1 (64bit, 288-pin module)
AUDIO
KBMS
LAN_USB78
USB3_56
USB3_34
18.5cm(7.3in)
SATA6G_5SATA6G_6 SATA6G_4
SATA6G_1SATA6G_2SATA6G_3
DVI
VGA
32 21 4
1
789
5
6
1
14
51012 1113
15
16
ScantheQRcodetogetthedetailedpindenitions.
1-2 Chapter 1: Product introduction
ATX power connectors (24-pin EATXPWR, 4-pin ATX12V)
CorrectlyorienttheATXpowersupplyplugsintotheseconnectorsandpushdown
rmlyuntiltheconnectorscompletelyt.
•
Forafullyconguredsystem,werecommendthatyouuseapowersupply
unit(PSU)thatcomplieswithATX12VSpecication2.0(orlaterversion)and
providesaminimumpowerof350W.
•
Ifyouareuncertainabouttheminimumpowersupplyrequirementforyoursystem,
refertotheRecommendedPowerSupplyWattageCalculatorathttp://support.
asus.com/PowerSupplyCalculator/PSCalculator.aspx?SLanguage=en-usfor
details.
CPU and chassis fan connectors (4-pin CPU_FAN, 4-pin CHA_FAN)
Connectthefancablestothefanconnectorsonthemotherboard,ensuringthat
theblackwireofeachcablematchesthegroundpinoftheconnector.
Donotforgettoconnectthefancablestothefanconnectors.Insufcientairowinside
thesystemmaydamagethemotherboardcomponents.Thesearenotjumpers!Donot
placejumpercapsonthefanconnectors!TheCPU_FANconnectorsupportsaCPU
fanofmaximum1A(12W)fanpower.
Intel® LGA1151 CPU socket
InstallIntel®LGA1151CPUintothissurfacemountLGA1151socket,whichis
designedfor7th/6thGenerationIntel®Core™i7/i5/i3,Pentium®,andCeleron®
processors.
Formoredetails,refertoCentral Processing Unit (CPU).
DDR4 DIMM slots
ThismotherboardcomeswithtwoDoubleDataRate4(DDR4)DualInlineMemory
Module(DIMM)sockets.ADDR4moduleisnotcheddifferentlyfromaDDR,
DDR2,orDDR3module.
Formoredetails,refertoSystem memory.
DONOTinstallaDDR,DDR2,orDDR3memorymoduletotheDDR4slot.
Intel® B250 Serial ATA 6.0Gb/s connectors (7-pin SATA6G_1~6)
TheseconnectorsconnecttoSerialATA6.0Gb/sharddiskdrivesviaSerialATA
6.0Gb/ssignalcables.
Whenusinghot-plugandNCQ,settheSATA Mode SelectionitemintheBIOSto
[AHCI].
Speaker connector (4-pin SPEAKER)
The4-pinconnectorisforthechassis-mountedsystemwarningspeaker.The
speakerallowsyoutohearsystembeepsandwarnings.
ASUS PRIME B250M-K 1-3
System panel connector (10-1 pin F_PANEL)
Thisconnectorsupportsseveralchassis-mountedfunctions.
Clear RTC RAM (2-pin CLRTC)
ThisheaderallowsyoutocleartheCMOSRTCRAMdataofthesystemsetup
informationsuchasdate,time,andsystempasswords.
To erase the RTC RAM:
1. TurnOFFthecomputerandunplugthepowercord.
2. Useametalobjectsuchasascrewdrivertoshortthetwopins.
3. PlugthepowercordandturnONthecomputer.
4. Holddownthe<Del>keyduringthebootprocessandenterBIOSsetupto
re-enterdata.
Ifthestepsabovedonothelp,removetheonboardbatteryandshortthetwopins
againtocleartheCMOSRTCRAMdata.AfterclearingtheCMOS,reinstallthe
battery.
USB 3.0 connector (20-1 pin USB3_12)
ConnectaUSB3.0moduletothisconnectorforadditionalUSB3.0frontorrear
panelports.ThisconnectorcomplieswithUSB3.0specicationsandprovidesfaster
datatransferspeedsofupto5Gbps,fasterchargingtimeforUSB-chargeable
devices,optimizedpowerefciency,andbackwardcompatibilitywithUSB2.0.
USB 2.0 connectors (10-1 pin USB910, USB1112)
ConnecttheUSBmodulecabletoanyoftheseconnectors,theninstallthemodule
toaslotopeningatthebackofthesystemchassis.TheseUSBconnectorscomply
withUSB2.0specicationsandsupportsupto480Mbpsconnectionspeed.
Digital audio connector (4-1 pin SPDIF_OUT)
ConnecttheS/PDIFOutmodulecabletothisconnector,then
installthemoduletoaslotopeningatthebackofthesystem
chassis.
Serial port connector (10-1 pin COM)
Connecttheserialportmodulecabletothisconnector,theninstallthemoduletoa
slotopeningatthebackofthesystemchassis.
Front panel audio connector (10-1 pin AAFP)
Thisconnectorisforachassis-mountedfrontpanelaudioI/Omodulethatsupports
eitherHDAudioorlegacyAC`97audiostandard.Connectoneendofthefrontpanel
audioI/Omodulecabletothisconnector.
CLRTC
+3V_BAT
GND
PIN 1
SPDIF_OUT
+5V
SPDIFOUT
GND
PIN 1
1-4 Chapter 1: Product introduction
A B C D
HDAudio shared – – –
XHCIController shared – – –
SATAController shared – – –
RealtekLANController –––shared
PCIEx16 shared – – –
PCIEx1_1 shared – – –
PCIEx1_2 –shared – –
M.2 shared – – –
• Werecommendthatyouconnectahigh-denitionfrontpanelaudiomoduletothis
connectortoavailofthemotherboard’shigh-denitionaudiocapability.
• Ifyouwanttoconnectahigh-denitionfrontpanelaudiomoduletothisconnector,
settheFrontPanelTypeitemintheBIOSsetupto[HDAudio].Ifyouwantto
connectanAC’97frontpanelaudiomoduletothisconnector,settheitemto
[AC97].Bydefault,thisconnectorissetto[HDAudio].
PCI Express 3.0/2.0 x1 slots
ThismotherboardsupportstwoPCIExpressx1networkcards,SCSIcards,and
othercardsthatcomplywiththePCIExpressspecications.
PCI Express 3.0/2.0 x16 slot
ThismotherboardhasaPCIExpress3.0/2.0x16slotthatsupportsPCIExpress
3.0/2.0x16graphiccardscomplyingwiththePCIExpressspecications.
M.2 socket 3
ThissocketallowsyoutoinstallanM.2(NGFF)SSDmodule.
•
ThissocketsupportsMKeyand2242/2260/2280
storagedevices.
• WhenadeviceinSATAmodeisinstalledontheM.2
socket,SATA_1portcannotbeused.
WhenusingPCIcardsonsharedslots,ensurethatthedriverssupport“ShareIRQ”orthat
thecardsdonotneedIRQassignments.Otherwise,conictswillarisebetweenthetwoPCI
groups,makingthesystemunstableandthecardinoperable.
IRQ assignments for this motherboard
M.2(SOCKET3)
ASUS PRIME B250M-K 1-5
1. PS/2 mouse port (green).ThisportisforaPS/2mouse.
2. Video Graphics Adapter (VGA) port.This15-pinportisfora
VGAmonitororotherVGA-compatibledevices.
3. LAN (RJ-45) port.ThisportallowsGigabitconnectiontoa
LocalAreaNetwork(LAN)throughanetworkhub.
LAN port LED indications
Rear panel connectors
24 53
6
8 7
1
10 9
4. Line In port (light blue).Thisportconnectstothetape,CD,DVDplayer,orother
audiosources.
5. Line Out port (lime).Thisportconnectstoaheadphoneoraspeaker.Inthe4.1,5.1
and7.1-channelcongurations,thefunctionofthisportbecomesFrontSpeakerOut.
6. Microphone port (pink).Thisportconnectstoamicrophone.
Refertotheaudiocongurationtableforthefunctionoftheaudioportsin2.1,4.1,5.1,or
7.1-channelconguration.
Activity/Link LED Speed LED
Status Description Status Description
Off Nolink OFF 10Mbpsconnection
Orange Linked ORANGE 100Mbpsconnection
Orange(Blinking) Dataactivity GREEN 1Gbpsconnection
Orange(Blinking
thensteady)
Readytowakeup
fromS5mode
_ _
LAN port
Speed
LED
Activity Link
LED
1-6 Chapter 1: Product introduction
Audio 2.1, 4.1, 5.1, or 7.1-channel conguration
Port Headset
2.1-channel 4.1-channel 5.1-channel 7.1-channel
LightBlue(Rear
panel) LineIn RearSpeakerOut RearSpeakerOut RearSpeakerOut
Lime(Rearpanel) LineOut FrontSpeakerOut FrontSpeakerOut FrontSpeakerOut
Pink(Rearpanel) MicIn MicIn Bass/Center Bass/Center
Lime(Frontpanel) - - - SideSpeakerOut
To congure a 7.1-channel audio output:
UseachassiswithHDaudiomoduleinthefrontpaneltosupporta7.1-channelaudio
output.
7. USB 2.0 ports.These4-pinUniversalSerialBus(USB)portsareforUSB2.0/1.1
devices.
8. USB 3.0 ports.These9-pinUniversalSerialBus(USB)portsareforUSB3.0devices.
• USB3.0devicescanonlybeusedfordatastorage.
• WestronglyrecommendthatyouconnectUSB3.0devicestoUSB3.0portsforfaster
andbetterperformancefromyourUSB3.0devices.
• DuetothedesignoftheIntel®200serieschipset,allUSBdevicesconnectedtothe
USB2.0andUSB3.0portsarecontrolledbythexHCIcontroller.SomelegacyUSB
devicesmustupdatetheirrmwareforbettercompatibility.
9.DVI-D port.ThisportisforanyDVI-Dcompatibledevice.
DVI-DcannotbeconvertedtooutputfromRGBSignaltoCRTandisnotcompatiblewith
DVI-I.
10. PS/2 keyboard port (purple).ThisportisforaPS/2keyboard.
ASUS PRIME B250M-K 1-7
Central Processing Unit (CPU)
ThismotherboardcomeswithasurfacemountLGA1151socket
designedfor7th/6thGenerationIntel®Core™i7/i5/i3,Pentium®,and
Celeron®processors.
• EnsurethatyouinstallthecorrectCPUdesignedfortheLGA1151socketonly.DO
NOTinstallaCPUdesignedforLGA1150,LGA1155andLGA1156socketsonthe
LGA1151socket.
• Uponpurchaseofthemotherboard,ensurethatthePnPcapisonthesocketand
thesocketcontactsarenotbent.ContactyourretailerimmediatelyifthePnPcap
ismissing,orifyouseeanydamagetothePnPcap/socketcontacts/motherboard
components.
• Keepthecapafterinstallingthemotherboard.ASUSwillprocessReturnMerchandise
Authorization(RMA)requestsonlyifthemotherboardcomeswiththecaponthe
LGA1151socket.
• Theproductwarrantydoesnotcoverdamagetothesocketcontactsresultingfrom
incorrectCPUinstallation/removal,ormisplacement/loss/incorrectremovalofthePnP
cap.
Installing the CPU
1
4
UnplugallpowercablesbeforeinstallingtheCPU.
ApplytheThermalInterfaceMaterialtotheCPUheatsinkandCPUbeforeyouinstallthe
heatsinkandfanifnecessary.
2
3
A
B
A
B
C
D
5
4
4
5
1-8 Chapter 1: Product introduction
System memory
Overview
ThismotherboardcomeswithtwoDoubleDataRate4(DDR4)DualInlineMemoryModule
(DIMM)sockets.ADDR4moduleisnotcheddifferentlyfromaDDR,DDR2,orDDR3module.
DONOTinstallaDDR,DDR2,orDDR3memorymoduletotheDDR4slot.
Channel Sockets
ChannelA DIMM_A1
ChannelB DIMM_B1
DIMM_A1
DIMM_B1
• YoumayinstallvaryingmemorysizesinChannelAandChannelB.Thesystem
mapsthetotalsizeofthelower-sizedchannelforthedual-channelconguration.Any
excessmemoryfromthehigher-sizedchannelisthenmappedforsingle-channel
operation.
• AlwaysinstalltheDIMMSwiththesameCASLatency.Foranoptimumcompatibility,
werecommendthatyouinstallmemorymodulesofthesameversionordatacode
(D/C)fromthesamevendor.Checkwiththevendortogetthecorrectmemory
modules.
• AccordingtoIntel®CPUspec,DIMMvoltagebelow1.35Visrecommendedtoprotect
theCPU.
• Duetothememoryaddresslimitationon32-bitWindows®OS,whenyouinstall4GB
ormorememoryonthemotherboard,theactualusablememoryfortheOScanbe
about3GBorless.Foreffectiveuseofmemory,werecommendthatyoudoanyofthe
following:
- Useamaximumof3GBsystemmemoryifyouareusinga32-bitWindows®OS.
- Installa64-bitWindows®OSifyouwanttoinstall4GBormoreonthe
motherboard.
- Formoredetails,refertotheMicrosoft®supportsiteathttp://support.microsoft.
com/kb/929605/en-us.
VisittheASUSwebsiteatwww.asus.comforthelatestQVL.
Installing a DIMM
1 2
To remove a DIMM
B
A
B
A
A
BIOS information
2
• ScantheQRcodetoviewtheBIOSupdateguide.
• BeforeusingtheASUSCrashFreeBIOS3utility,renamethe
BIOSleintheremovabledeviceintoB250MK.CAP.
BIOS setup program
UsetheBIOSSetupprogramtoupdatetheBIOSorcongureitsparameters.TheBIOS
screensincludenavigationkeysandbriefonlinehelptoguideyouinusingtheBIOSSetup
program.
Entering BIOS Setup at startup
To enter BIOS Setup at startup:
Press<Delete>or<F2>duringthePower-OnSelfTest(POST).Ifyoudonotpress<Delete>
or<F2>,POSTcontinueswithitsroutines.
Entering BIOS Setup after POST
To enter BIOS Setup after POST:
Press<Ctrl>+<Alt>+<Del>simultaneously.
Presstheresetbuttononthesystemchassis.
Pressthepowerbuttontoturnthesystemoffthenbackon.Dothisoptiononlyifyoufailedto
enterBIOSSetupusingthersttwooptions.
Usingthepowerbutton,resetbutton,orthe<Ctrl>+<Alt>+<Del>keystoforceresetfroma
runningoperatingsystemcancausedamagetoyourdataorsystem.Werecommendyou
alwaysshutdownthesystemproperlyfromtheoperatingsystem.
• TheBIOSsetupscreensshowninthissectionareforreferencepurposesonly,and
maynotexactlymatchwhatyouseeonyourscreen.
• VisittheASUSwebsiteatwww.asus.comtodownloadthelatestBIOSleforthis
motherboard.
• IfthesystembecomesunstableafterchanginganyBIOSsetting,loadthedefault
settingstoensuresystemcompatibilityandstability.SelecttheLoad Optimized
DefaultsitemundertheExitmenuorpresshotkeyF5.
• IfthesystemfailstobootafterchanginganyBIOSsetting,trytocleartheCMOSand
resetthemotherboardtothedefaultvalue.SeesectionMotherboard overviewfor
informationonhowtoerasetheRTCRAM.
BIOS menu screen
TheBIOSsetupprogramcanbeusedundertwomodes:EZ ModeandAdvanced Mode.
Press<F7>tochangebetweenthetwomodes.
ASUS PRIME B250M-K 2-1
EZ Mode
Bydefault,theEZModescreenappearswhenyouentertheBIOSsetupprogram.TheEZ
Modeprovidesyouanoverviewofthebasicsysteminformation,andallowsyoutoselectthe
displaylanguage,systemperformancemode,fanproleandbootdevicepriority.Toaccess
theAdvancedMode,clickAdvanced Mode(F7)orpress<F7>.
ThedefaultscreenforenteringtheBIOSsetupprogramcanbechanged.
Thebootdeviceoptionsvarydependingonthedevicesyouinstalledtothesystem.
Saves the changes
and resets the
system
Selects the display
language of the BIOS
setup program
Displays the CPU/motherboard
temperature, CPU voltage output,
CPU/chassis fan speed, and SATA
information
Displays the system properties of
the selected mode. Click <Enter> to
switch EZ System Tuning modes
Displays the
Advanced mode
menus
Selects the boot
device priority
Loads optimized
default settings
Shows the
bootable
devices
Displays the CPU Fan’s speed
Click the button to manually
tune the fans Search on FAQ
2-2 Chapter 2: BIOS information
Conguration
elds
Menu bar
General helpSub-menu items
Menu items
Scroll bar
Last modied
settings
Language
Hot Keys
MyFavorite Q-Fan control
Goes back
to EZ Mode
Displays the CPU temperature, CPU
and memory voltage output
Advanced Mode
TheAdvancedModeprovidesadvancedoptionsforexperiencedend-userstocongurethe
BIOSsettings.ThegurebelowshowsanexampleoftheAdvanced Mode.Refertothe
followingsectionsforthedetailedcongurations.
ToaccesstheEZMode,clickEzMode(F7)orpress<F7>.
Popup window
Search on
FAQ
ASUS PRIME B250M-K 2-3
Load Optimized Defaults
ThisoptionallowsyoutoloadthedefaultvaluesforeachoftheparametersontheSetup
menus.Whenyouselectthisoptionorifyoupress<F5>,aconrmationwindowappears.
SelectOKtoloadthedefaultvalues.
Save Changes & Reset
Onceyouarenishedmakingyourselections,choosethisoptionfromtheExitmenuto
ensurethevaluesyouselectedaresaved.Whenyouselectthisoptionorifyoupress<F10>,
aconrmationwindowappears.SelectOKtosavechangesandexit.
Discard Changes and Exit
ThisoptionallowsyoutoexittheSetupprogramwithoutsavingyourchanges.Whenyou
selectthisoptionorifyoupress<Esc>,aconrmationwindowappears.SelectOKtodiscard
changesandexit.
Launch EFI Shell from USB drives
ThisoptionallowsyoutoattempttolaunchtheEFIShellapplication(shellx64.e)fromoneof
theavailableUSBdevices.
Exit menu
TheExitmenuitemsallowyoutoloadtheoptimaldefaultvaluesfortheBIOSitems,and
saveordiscardyourchangestotheBIOSitems.
Search on FAQ
MoveyourmouseoverthisbuttontoshowaQRcode.ScanthisQRcodewithyourmobile
devicetoconnecttotheASUSBIOSFAQwebpage.YoucanalsoscantheQRcodebelow.
2-4 Chapter 2: BIOS information
ASUS PRIME B250M-K A-1
Appendix
Notices
Federal Communications Commission Statement
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two
conditions:
• This device may not cause harmful interference.
• This device must accept any interference received including interference that may cause
undesired operation.
This equipment has been tested and found to comply with the limits for a Class B digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This
equipment generates, uses and can radiate radio frequency energy and, if not installed
and used in accordance with manufacturer’s instructions, may cause harmful interference
to radio communications. However, there is no guarantee that interference will not occur
in a particular installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and on, the user
is encouraged to try to correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment to an outlet on a circuit different from that to which the receiver
is connected.
• Consult the dealer or an experienced radio/TV technician for help.
The use of shielded cables for connection of the monitor to the graphics card is required
toassurecompliancewithFCCregulations.Changesormodicationstothisunitnot
expressly approved by the party responsible for compliance could void the user’s authority
to operate this equipment.
Appendix
A-2 Appendix
IC: Canadian Compliance Statement
ComplieswiththeCanadianICES-003ClassBspecications.ThisdevicecomplieswithRSS
210 of Industry Canada. This Class B device meets all the requirements of the Canadian
interference-causing equipment regulations.
This device complies with Industry Canada license exempt RSS standard(s). Operation is
subject to the following two conditions: (1) this device may not cause interference, and (2)
this device must accept any interference, including interference that may cause undesired
operation of the device.
Cet appareil numérique de la Classe B est conforme à la norme NMB-003 du Canada.
Cet appareil numérique de la Classe B respecte toutes les exigences du Règlement sur le
matériel brouilleur du Canada.
Cet appareil est conforme aux normes CNR exemptes de licence d’Industrie Canada. Le
fonctionnement est soumis aux deux conditions suivantes :
(1) cet appareil ne doit pas provoquer d’interférences et
(2) cet appareil doit accepter toute interférence, y compris celles susceptibles de provoquer
un fonctionnement non souhaité de l’appareil.
Canadian Department of Communications Statement
This digital apparatus does not exceed the Class B limits for radio noise emissions from
digital apparatus set out in the Radio Interference Regulations of the Canadian Department
of Communications.
This class B digital apparatus complies with Canadian ICES-003.
VCCI: Japan Compliance Statement
Class B ITE
KC: Korea Warning Statement
ASUS PRIME B250M-K A-3
REACH
Complying with the REACH (Registration, Evaluation, Authorisation, and Restriction of
Chemicals) regulatory framework, we published the chemical substances in our products at
ASUS REACH website at http://csr.asus.com/english/REACH.htm.
DO NOT throw the motherboard in municipal waste. This product has been designed to
enable proper reuse of parts and recycling. This symbol of the crossed out wheeled bin
indicates that the product (electrical and electronic equipment) should not be placed in
municipal waste. Check local regulations for disposal of electronic products.
DO NOT throw the mercury-containing button cell battery in municipal waste. This symbol
of the crossed out wheeled bin indicates that the battery should not be placed in municipal
waste.
ASUS Recycling/Takeback Services
ASUS recycling and takeback programs come from our commitment to the highest standards
for protecting our environment. We believe in providing solutions for you to be able to
responsibly recycle our products, batteries, other components as well as the packaging
materials. Please go to http://csr.asus.com/english/Takeback.htm for detailed recycling
information in different regions.
Regional notice for California
WARNING! This product may contain chemicals known to the State of California to cause
cancer, birth defects or other reproductive harm. Wash hands after handling.
Google™ License Terms
Copyright© 2016 Google Inc. All Rights Reserved.
LicensedundertheApacheLicense,Version2.0(the“License”);youmaynotusethisle
except in compliance with the License. You may obtain a copy of the License at:
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software distributed under the
License is distributed on an “AS IS” BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
ANY KIND, either express or implied.
SeetheLicenseforthespeciclanguagegoverningpermissionsandlimitationsunderthe
License.
A-4 Appendix
Română ASUSTeK Computer Inc. declară că acest dispozitiv se conformează
cerinţelor esenţiale şi altor prevederi relevante ale directivelor conexe. Textul
complet al declaraţiei de conformitate a Uniunii Europene se găseşte la:
www.asus.com/support
Srpski ASUSTeK Computer Inc. ovim izjavljuje da je ovaj uređaj u saglasnosti
sa osnovnim zahtevima i drugim relevantnim odredbama povezanih
Direktiva. Pun tekst EU deklaracije o usaglašenosti je dostupan da adresi:
www.asus.com/support
Slovensky Spoločnosť ASUSTeK Computer Inc. týmto vyhlasuje, že toto
zariadenie vyhovuje základným požiadavkám a ostatým príslušným
ustanoveniam príslušných smerníc. Celý text vyhlásenia o zhode pre štáty EÚ
je dostupný na adrese: www.asus.com/support
Slovenščina ASUSTeK Computer Inc. izjavlja, da je ta naprava skladna z
bistvenimi zahtevami in drugimi ustreznimi določbami povezanih direktiv.
Celotno besedilo EU-izjave o skladnosti je na voljo na spletnem mestu:
www.asus.com/support
Español Por la presente, ASUSTeK Computer Inc. declara que este dispositivo
cumple los requisitos básicos y otras disposiciones pertinentes de las
directivas relacionadas. El texto completo de la declaración de la UE de
conformidad está disponible en: www.asus.com/support
Svenska ASUSTeK Computer Inc. förklarar härmed att denna
enhet överensstämmer med de grundläggande kraven och andra
relevanta föreskrifter i relaterade direktiv. Fulltext av EU-försäkran om
överensstämmelse finns på: www.asus.com/support
Українська ASUSTeK Computer Inc. заявляє, що цей пристрій відповідає
основним вимогам та іншим відповідним положенням відповідних
Директив. Повний текст декларації відповідності стандартам ЄС
доступний на: www.asus.com/support
Türkçe AsusTek Computer Inc., bu aygıtın temel gereksinimlerle ve ilişkili
Yönergelerin diğer ilgili koşullarıyla uyumlu olduğunu beyan eder. AB
uygunluk bildiriminin tam metni şu adreste bulunabilir:
www.asus.com/support
Bosanski ASUSTeK Computer Inc. ovim izjavljuje da je ovaj uređaj usklađen
sa bitnim zahtjevima i ostalim odgovarajućim odredbama vezanih direktiva.
Cijeli tekst EU izjave o usklađenosti dostupan je na: www.asus.com/support
English ASUSTeK Computer Inc. hereby declares that this device is in
compliance with the essential requirements and other relevant provisions of
related Directives. Full text of EU declaration of conformity is available at:
www.asus.com/support
Français AsusTek Computer Inc. déclare par la présente que cet appareil est
conforme aux critères essentiels et autres clauses pertinentes des directives
concernées. La déclaration de conformité de l’UE peut être téléchargée à
partir du site Internet suivant : www.asus.com/support
Deutsch ASUSTeK Computer Inc. erklärt hiermit, dass dieses Gerät mit
den wesentlichen Anforderungen und anderen relevanten Bestimmungen
der zugehörigen Richtlinien übereinstimmt. Der gesamte Text der EU-
Konformitätserklärung ist verfügbar unter: www.asus.com/support
Italiano ASUSTeK Computer Inc. con la presente dichiara che questo
dispositivo è conforme ai requisiti essenziali e alle altre disposizioni pertinenti
con le direttive correlate. Il testo completo della dichiarazione di conformità
UE è disponibile all’indirizzo: www.asus.com/support
Русский Компания ASUS заявляет, что это устройство соответствует
основным требованиям и другим соответствующим условиям
соответствующих директив. Подробную информацию, пожалуйста,
смотрите на www.asus.com/support
Български С настоящото ASUSTeK Computer Inc. декларира, че това
устройство е в съответствие със съществените изисквания и другите
приложими постановления на свързаните директиви. Пълният текст на
декларацията за съответствие на ЕС е достъпна на адрес:
www.asus.com/support
Hrvatski ASUSTeK Computer Inc. ovim izjavljuje da je ovaj uređaj sukladan
s bitnim zahtjevima i ostalim odgovarajućim odredbama vezanih direktiva.
Cijeli tekst EU izjave o sukladnosti dostupan je na: www.asus.com/support
Čeština Společnost ASUSTeK Computer Inc. tímto prohlašuje, že toto
zařízení splňuje základní požadavky a další příslušná ustanovení souvisejících
směrnic. Plné znění prohlášení o shodě EU je k dispozici na adrese:
www.asus.com/support
Dansk ASUSTeK Computer Inc. erklærer hermed, at denne enhed er i
overensstemmelse med hovedkravene og andre relevante bestemmelser i de
relaterede direktiver. Hele EU-overensstemmelseserklæringen kan findes på:
www.asus.com/support
Nederlands ASUSTeK Computer Inc. verklaart hierbij dat dit apparaat
voldoet aan de essentiële vereisten en andere relevante bepalingen van
de verwante richtlijnen. De volledige tekst van de EU-verklaring van
conformiteit is beschikbaar op: www.asus.com/support
Eesti Käesolevaga kinnitab ASUSTeK Computer Inc, et see seade vastab
asjakohaste direktiivide oluliste nõuetele ja teistele asjassepuutuvatele
sätetele. EL vastavusdeklaratsiooni täielik tekst on saadaval järgmisel
aadressil: www.asus.com/support
Suomi ASUSTeK Computer Inc. ilmoittaa täten, että tämä laite on
asiaankuuluvien direktiivien olennaisten vaatimusten ja muiden tätä
koskevien säädösten mukainen. EU-yhdenmukaisuusilmoituksen koko teksti
on luettavissa osoitteessa: www.asus.com/support
Ελληνικά Με το παρόν, η AsusTek Computer Inc. δηλώνει ότι αυτή η
συσκευή συμμορφώνεται με τις θεμελιώδεις απαιτήσεις και άλλες σχετικές
διατάξεις των Οδηγιών της ΕΕ. Το πλήρες κείμενο της δήλωσης συμβατότητας
είναι διαθέσιμο στη διεύθυνση: www.asus.com/support
Magyar Az ASUSTeK Computer Inc. ezennel kijelenti, hogy ez az eszköz
megfelel a kapcsolódó Irányelvek lényeges követelményeinek és egyéb
vonatkozó rendelkezéseinek. Az EU megfelelőségi nyilatkozat teljes szövege
innen letölthető: www.asus.com/support
Latviski ASUSTeK Computer Inc. ar šo paziņo, ka šī ierīce atbilst saistīto
Direktīvu būtiskajām prasībām un citiem citiem saistošajiem nosacījumiem.
Pilns ES atbilstības paziņojuma teksts pieejams šeit: www.asus.com/support
Lietuvių „ASUSTeK Computer Inc.“ šiuo tvirtina, kad šis įrenginys atitinka
pagrindinius reikalavimus ir kitas svarbias susijusių direktyvų nuostatas. Visą
ES atitikties deklaracijos tekstą galima rasti: www.asus.com/support
Norsk ASUSTeK Computer Inc. erklærer herved at denne enheten er i
samsvar med hovedsaklige krav og andre relevante forskrifter i relaterte
direktiver. Fullstendig tekst for EU-samsvarserklæringen finnes på:
www.asus.com/support
Polski Firma ASUSTeK Computer Inc. niniejszym oświadcza, że
urządzenie to jest zgodne z zasadniczymi wymogami i innymi właściwymi
postanowieniami powiązanych dyrektyw. Pełny tekst deklaracji zgodności UE
jest dostępny pod adresem: www.asus.com/support
Português A ASUSTeK Computer Inc. declara que este dispositivo está em
conformidade com os requisitos essenciais e outras disposições relevantes
das Diretivas relacionadas. Texto integral da declaração da UE disponível em:
www.asus.com/support
ASUS PRIME B250M-K A-5
ASUS contact information
ASUSTeK COMPUTER INC.
Address 4F, No. 150, Li-Te Road, Peitou, Taipei 112, Taiwan
Telephone +886-2-2894-3447
Fax +886-2-2890-7798
Web site www.asus.com
Technical Support
Telephone +86-21-38429911
Fax +86-21-5866-8722, ext. 9101#
Online support http://qr.asus.com/techserv
ASUS COMPUTER INTERNATIONAL (America)
Address 800 Corporate Way, Fremont, CA 94539, USA
Telephone +1-510-739-3777
Fax +1-510-608-4555
Web site http://www.asus.com/us/
Technical Support
Support fax +1-812-284-0883
Telephone +1-812-282-2787
Online support http://qr.asus.com/techserv
ASUS COMPUTER GmbH (Germany and Austria)
Address Harkort Str. 21-23, 40880 Ratingen, Germany
Fax +49-2102-959931
Web site http://www.asus.com/de
Online contact http://eu-rma.asus.com/sales
Technical Support
Telephone +49-2102-5789555
Support Fax +49-2102-959911
Online support http://qr.asus.com/techserv
A-6 Appendix
DECLARATION OF CONFORMITY
Per FCC Part 2 Section 2. 1077(a)
Responsible Party Name: Asus Computer International
Address: 800 Corporate Way, Fremont, CA 94539.
Phone/Fax No: (510)739-3777/(510)608-4555
hereby declares that the product
Product Name : Motherboard
Model Number : PRIME B250M-K
Conforms to the following specifications:
FCC Part 15, Subpart B, Unintentional Radiators
Supplementary Information:
This device complies with part 15 of the FCC Rules. Operation is subject to the
following two conditions: (1) This device may not cause harmful interference,
and (2) this device must accept any interference received, including interference
that may cause undesired operation.
Representative Person’s Name : Steve Chang / President
Signature :
Date : Nov. 14, 2016
Ver. 140331