Asus B450M-A/CSM User manual

Motherboard
PRIME A320M-K
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ii
E12854
Revised Edition
April 2017
Copyright © 2017 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, modied or altered, unless
such repair, modication of alteration is authorized in writing by ASUS; or (2) the serial number of the
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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
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DEFECT OR ERROR IN THIS MANUAL OR PRODUCT.
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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
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Where the applicable license entitles you to the source code of such software and/or other additional data,
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(2) for the cost of reproduction and shipment, which is dependent on the preferred carrier and the location
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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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The source code will be distributed WITHOUT ANY WARRANTY and licensed under the same license as
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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 A320M-K specications summary................................................ vi
Chapter 1: Product introduction
Motherboard overview ............................................................................. 1-1
Central Processing Unit (CPU)................................................................ 1-8
System memory........................................................................................ 1-9
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 qualied 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 qualied service
technician or your retailer.
About this guide
This user guide contains the information you need when installing and conguring 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.

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 A320M-K specications summary
(continued on the next page)
Package contents
Check your motherboard package for the following items.
Motherboard ASUS PRIME A320M-K motherboard
Cables 2 x Serial ATA 6.0 Gb/s cables
Accessories 1 x I/O shield
1 x M.2 screw package
Application DVD 1 x Support DVD
Documentation 1 x User Manual
If any of the above items is damaged or missing, contact your retailer.
CPU
AM4 socket for AMD Ryzen™ / 7th Generation A-series / Athlon™ processors
Supports CPU up to 8 cores*
* Due to CPU limitation, CPU cores supported vary by processor.
** Refer to www.asus.com for AMD CPU support list.
Chipset AMD A320 chipset
Memory
AMD Ryzen™ processors:
2 x DIMMs, max. 32GB, DDR4 3200(O.C.)/2933(O.C.)/2666/2400/2133 MHz, ECC
and non-ECC, un-buffered memory
AMD 7th Generation A-series / Athlon™ processors:
2 x DIMMs, max. 32GB, DDR4 2400/2133 MHz, non-ECC un-buffered memory
Dual-channel memory architecture
* Refer to www.asus.com for the latest Memory QVL (Qualied Vendors List).
Graphics
Integrated AMD Radeon™ R Series Graphics in the 7th Generation A-series APU
Multi-VGA output support: HDMI, and D-Sub ports
- Supports HDMI 1.4b with maximum resolution of 4096 x 2160 @24Hz / 2560 x
1600 @60Hz
- Supports D-Sub with maximum resolution of 1920 x 1200 @60Hz
- Maximum shared memory of 2048 MB
Expansion
slots
AMD Ryzen™ processors:
1 x PCI Express 3.0/2.0 x16 slot (max. @x16 mode)
AMD 7th Generation A-series / Athlon™ processors:
1 x PCI Express 3.0/2.0 x16 slot (max. @x8 mode)
AMD A320 Chipset:
2 x PCI Express 2.0 x1 slots
LAN Realtek®8111H Gigabit LAN controller
Audio
Realtek® ALC 887-VD2 8-Channel High Denition Audio CODEC
* Use a chassis with HD audio module in the front panel to support an 8-channel audio
output.

vii
PRIME A320M-K specications summary
(continued on the next page)
Storage
AMD A320 Chipset
- 4 x Serial ATA 6.0 Gb/s connectors with RAID 0, RAID 1 and RAID 10 support
AMD Ryzen™ processors:
- 1 x M.2 socket 3 with M Key, Type 2242/2260/2280 (PCIe 3.0 x4 and SATA
modes) storage devices support
AMD 7th Generation A-series / Athlon™ processors:
- 1 x M.2 socket 3 with M Key, Type 2242/2260/2280 (SATA mode) storage
devices support
USB
AMD Ryzen™ / 7th Generation A-series / Athlon™ processors
- 4 x USB 3.1 Gen 1 ports (4 ports at back panel)
AMD A320 Chipset:
- 2 x USB 3.1 Gen 1 ports ( 2 ports at mid-board)
- 6 x USB 2.0/1.1 ports ( 2 ports at back panel, 4 ports at mid-board)
ASUS unique
features
Dependable Stability
ASUS 5X PROTECTION III
- ASUS SafeSlot Core: Fortied 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 Stainless-Steel Back I/O: 3X corrosion-resistance for greater durability!
- ASUS DIGI+ VRM: 6 Phase digital power design
Superb performance
UEFI BIOS
- Most advanced options with fast response time
Easy PC DIY
Safe motherboard mounting
- Component-free areas to minimize damage risk
Q-Design
- ASUS Q-DIMM
- ASUS Q-Slot
UEFI BIOS EZ Mode
- featuring friendly graphics user interface
- ASUS CrashFree BIOS 3
- ASUS EZ Flash 3
ASUS Quiet
Thermal
Solution
Quiet Thermal Design:
- Stylish Fanless Design: Chipset Heat-sink solution
- ASUS Fan Xpert

viii
PRIME A320M-K specications summary
Rear panel I/O
ports
1 x PS/2 keyboard port (purple)
1 x PS/2 mouse port (green)
1 x HDMI port
1 x D-Sub port
1 x LAN (RJ-45) port
2 x USB 2.0/1.1 ports
4 x USB 3.1 Gen 1 ports
3 x Audio jacks support 8-channel audio output
Internal
connectors
1 x USB 3.1 Gen 1 connector supports additional 2 USB 3.1 Gen 1 ports
2 x USB 2.0/1.1 connectors support additional 4 USB 2.0/1.1 ports
1 x M.2 socket 3 for M Key and type 2242/2260/2280 devices
4 x SATA 6.0Gb/s connectors
1 x COM connector
1 x CPU Fan connector
1 x Chassis Fan connector
1 x Front panel audio connector
1 x 24-pin EATX power connector
1 x 4-pin ATX 12V power connector
1 x 2-pin Clear CMOS header
1 x S/PDIF out connector
1 x Speaker connector
1 x System panel connector
BIOS features
128 Mb Flash ROM, UEFI AMI BIOS, PnP, WfM2.0, SM BIOS 3.0, ACPI 6.1,
Multi-language BIOS, ASUS EZ Flash 3, ASUS CrashFree BIOS 3, My
Favorites, Last Modied log, F12 PrintScreen, ASUS DRAM SPD (Serial
Presence Detect) memory information, F6 Qfan Control
Manageability WfM 2.0, DMI 3.0, WOL by PME, PXE
Support DVD
Drivers
ASUS utilities
ASUS Update
Anti-virus software (OEM version)
OS support Windows®10 (64-bit)
Form factor uATX form factor: 8.9” x 8.7” (22.6 cm x 22.1 cm)
Specications are subject to change without notice.

ASUS PRIME A320M-K 1-1
Product introduction
1
Motherboard overview
• Unplugthepowercordfromthewallsocketbeforetouchinganycomponent.
• Beforehandlingcomponents,useagroundedwriststraportouchasafelygrounded
objectorametalobject,suchasthepowersupplycase,toavoiddamagingthemdue
tostaticelectricity.
• Beforeyouinstallorremoveanycomponent,ensurethattheATXpowersupplyis
switchedofforthepowercordisdetachedfromthepowersupply.Failuretodoso
maycauseseveredamagetothemotherboard,peripherals,orcomponents.
• Unplugthepowercordbeforeinstallingorremovingthemotherboard.Failuretodoso
cancauseyouphysicalinjuryanddamagetomotherboardcomponents.
Place this
side towards
the rear of the
chassis
ScantheQRcodetogetthedetailedpindenitions.
PRIME A320M-K
PCIEX16
PCIEX1_1
PCIEX1_2
SPEAKER
CLRTC
F_PANEL
SPDIF_OUT
USB56USB34 USB3_12
AAFP
COM
EATXPWR
CPU_FAN
CHA_FAN
BATTERY
Super
I/O
ALC
887
Realtek
8111H
DIGI
+VRM
22.6cm(8.9in)
AMD®
A320
DDR4 DIMM_A1 (64bit, 288-pin module)
SOCKET AM4
2280 2260 2242
M.2_1(SOCKET3)
DDR4 DIMM_B1 (64bit,288-pin module)
AUDIO
KBMS
HDMI
LAN_USB3_34
USB12
USB3_56
22.1cm(8.7in)
128Mb
BIOS
SATA6G_3
SATA6G_4
SATA6G_1 SATA6G_2
VGA
ATX12V
LANGuard
1 42 23
1
6
7
8
1
1
5
15
910111214 13
16

1-2 Chapter 1: Product introduction
CPU and chassis fan connectors (4-pin CPU_FAN, 4-pin CHA_FAN)
Connectthefancablestothefanconnectorsonthemotherboard,ensuringthat
theblackwireofeachcablematchesthegroundpinoftheconnector.
Donotforgettoconnectthefancablestothefanconnectors.Insufcientairow
insidethesystemmaydamagethemotherboardcomponents.Thesearenot
jumpers!Donotplacejumpercapsonthefanconnectors!TheCPU_FANconnector
supportsaCPUfanofmaximum1A(12W)fanpower.
AMD AM4 CPU socket
ThismotherboardcomeswithanAMDAM4socketdesignedforAMD
Ryzen™/7thGenerationA-series/Athlon™Processors.
Formoredetails,refertoCentral Processing Unit (CPU).
DDR4 DIMM slots
Install2GB,4GB,8GB,and16GBunbufferedECCandnon-ECCDDR4DIMMs
intotheseDIMMsockets.
Formoredetails,refertoSystem memory.
M.2 socket 3
ThissocketallowsyoutoinstallM.2(NGFF)SSD
modules.
M.2(SOCKET3)
• ThisM.2socketsupportsMKeyand2242/2260/2280
storagedevices.
• DuetoCPUlimitation,M.2socketsupportedvariesby
processor.Refertothespecicationssummarytablefor
moredetails.
ATX power connectors (24-pin EATXPWR, 4-pin ATX12V)
TheseconnectorsareforATXpowersupplyplugs.Thepowersupplyplugsare
designedtottheseconnectorsinonlyoneorientation.Findtheproperorientation
andpushdownrmlyuntiltheconnectorscompletelyt.
• Forafullyconguredsystem,werecommendthatyouuseapowersupplyunit
(PSU)thatcomplieswithATX12VSpecication2.0(orlaterversion)andprovides
aminimumpowerof350W.ThisPSUtypehas24-pinand4-pinpowerplugs.
• DONOTforgettoconnectthe4-pinATX+12Vpowerplug.Otherwise,thesystem
willnotbootup.
• WerecommendthatyouuseaPSUwithhigherpoweroutputwhenconguringa
systemwithmorepower-consumingdevicesorwhenyouintendtoinstalladditional
devices.Thesystemmaybecomeunstableormaynotbootupifthepoweris
inadequate.
• Ifyouareuncertainabouttheminimumpowersupplyrequirementforyoursystem,
refertotheRecommendedPowerSupplyWattageCalculatorathttp://support.
asus.com/PowerSupplyCalculator/PSCalculator.aspx?SLanguage=en-usfor
details.

ASUS PRIME A320M-K 1-3
System panel connector (10-1 pin F_PANEL)
Thisconnectorsupportsseveralchassis-mountedfunctions.
Speaker connector (4-pin SPEAKER)
This4-pinconnectorisforthechassis-mountedsystemwarningspeaker.The
speakerallowsyoutohearsystembeepsandwarnings.
USB 3.1 Gen 1 connector (20-1 pin USB3_12)
ThisconnectorallowsyoutoconnectaUSB3.1Gen1moduleforadditionalUSB
3.1Gen1frontorrearpanelports.WithaninstalledUSB3.1Gen1module,you
canenjoyallthebenetsofUSB3.1Gen1includingfasterdatatransferspeeds
ofupto5Gbps,fasterchargingtimeforUSB-chargeabledevices,optimizedpower
efciencyandbackwardcompatibilitywithUSB2.0.
USB 2.0 connectors (10-1 pin USB34, USB56)
TheseconnectorsareforUSB2.0ports.ConnecttheUSBmodulecabletoany
oftheseconnectors,theninstallthemoduletoaslotopeningatthebackofthe
systemchassis.TheseUSBconnectorscomplywithUSB2.0specicationsand
supportupto480Mbpsconnectionspeed.
Neverconnecta1394cabletotheUSBconnectors.Doingsowilldamagethe
motherboard!
Clear RTC RAM (2-pin CLRTC)
ThisheaderallowsyoutocleartheCMOSRTCRAMdataof
thesystemsetupinformationsuchasdate,time,andsystem
passwords.
To erase the RTC RAM:
1. TurnOFFthecomputerandunplugthepowercord.
2. Useametalobjectsuchasascrewdrivertoshortthe
twopins.
3. PlugthepowercordandturnONthecomputer.
4. Holddownthe<Del>keyduringthebootprocessand
enterBIOSsetuptore-enterdata.
CLRTC
+3V_BAT GND
PIN 1
Ifthestepsabovedonothelp,removetheonboardbatteryandshortthetwopinsagain
tocleartheCMOSRTCRAMdata.AfterclearingtheCMOS,reinstallthebattery.
Serial port connector (10-1 pin COM)
Thisconnectorisforaserial(COM)port.Connecttheserialportmodulecableto
thisconnector,theninstallthemoduletoaslotopeningatthebackofthesystem
chassis.
AMD A320 Serial ATA 6.0Gb/s connectors (7-pin SATA6G_1~4)
TheseconnectorsconnecttoSerialATA6.0Gb/sharddiskdrivesviaSerialATA
6.0Gb/ssignalcables.

1-4 Chapter 1: Product introduction
Front panel audio connector (10-1 pin AAFP)
Thisconnectorisforachassis-mountedfrontpanelaudioI/Omodulethatsupports
eitherHDAudioorlegacyAC`97audiostandard.Connectoneendofthefront
panelaudioI/Omodulecabletothisconnector.
• Werecommendthatyouconnectahigh-denitionfrontpanelaudiomoduletothis
connectortoavailofthemotherboard’shigh-denitionaudiocapability.
• Ifyouwanttoconnectahigh-denitionfrontpanelaudiomoduletothisconnector,
settheFront Panel TypeitemintheBIOSsetupto[HDAudio].Ifyouwantto
connectanAC’97frontpanelaudiomoduletothisconnector,settheitemto
[AC97].Bydefault,thisconnectorissetto[HDAudio].
PCI Express 2.0 x1 slots
ThismotherboardhastwoPCIExpress2.0x1slotsthatsupportPCIExpressx1
networkcards,SCSIcards,andothercardsthatcomplywiththePCIExpress
specications.
PCI Express 3.0 / 2.0 x16 slot
ThismotherboardsupportsonePCIExpress3.0/2.0x16graphiccardthat
complieswiththePCIExpressspecications.
IRQ assignments for this motherboard
Digital audio connector (4-1 pin SPDIF_OUT)
ThisconnectorisforanadditionalSony/Philips
DigitalInterface(S/PDIF)port.ConnecttheS/
PDIFOutmodulecabletothisconnector,then
installthemoduletoaslotopeningatthebackof
thesystemchassis.
SPDIF_OUT
+5V SPDIFOUT GND
PIN 1
A B C D E F G H
PCIEx16_1 – – – shared ––––
PCIEx1_1 shared –––––––
PCIEx1_2 – – – shared ––––
M.2 – – – shared ––––
APUUSB3.1Gen1XHCI
controller – – shared –––––
AMDPromonotryChip
XHCIcontroller shared –––––––
SATAcontroller – – – shared ––––
HDaudiocontroller ––––––shared –
RealtekLANcontroller – – shared –––––
• ForAMDAM4A-series/Athlon™Seriesprocessors

ASUS PRIME A320M-K 1-5
WhenusingPCIcardsonsharedslots,ensurethatthedriverssupport“ShareIRQ”orthat
thecardsdonotneedIRQassignments.Otherwise,conictswillarisebetweenthetwoPCI
groups,makingthesystemunstableandthecardinoperable.
A B C D E F G H
PCIEx16_1 ––––––shared –
PCIEx1_1 shared –––––––
PCIEx1_2 – – – shared ––––
M.2 shared –––––––
APUUSB3.1Gen1XHCI
controller –––––––shared
AMDPromonotryChip
XHCIcontroller shared –––––––
SATAcontroller –shared ––––––
HDaudiocontroller – – – shared ––––
RealtekLANcontroller – – shared –––––
• ForRyzenTM processors

1-6 Chapter 1: Product introduction
LAN port
Speed
LED
Activity Link
LED
Activity/Link LED Speed LED
Status Description Status Description
Off Nolink OFF 10Mbpsconnection
Orange Linked ORANGE 100Mbpsconnection
Orange
(Blinking)
Dataactivity GREEN 1Gbpsconnection
Orange
(Blinkingthen
steady)
Readytowake
upfromS5mode
1. PS/2 Mouse (green) port.ThisportisforaPS/2mouse.
2. Video Graphics Adapter (VGA) port.This15-pinportisforaVGAmonitororother
VGA-compatibledevices.
3. USB 3.1 Gen 1 ports.Thesetwo9-pinUniversalSerialBus(USB)portsconnectto
USB3.1Gen1devices.
• USB3.1Gen1devicescanonlybeusedfordatastorage.
• DuetothedesignofAMDAM4serieschipset,allUSBdevicesconnectedtotheUSB
2.0andUSB3.1Gen1portsarecontrolledbythexHCIcontroller.
• WestronglyrecommendthatyouconnectUSB3.1Gen1devicestoUSB3.1Gen1
portsforfasterandbetterperformancefromyourUSB3.1Gen1devices.
1 4 5
310
36 7
8
9
2
1.2.2 Rear panel connectors
4. USB 2.0 ports.These4-pinUniversalSerialBus(USB)portsareforUSB2.0/1.1
devices.
5. LAN (RJ-45) port.ThisportallowsGigabitconnectiontoaLocalAreaNetwork(LAN)
throughanetworkhub.
LAN port LED indications

ASUS PRIME A320M-K 1-7
9. HDMI port.ThisportisforaHigh-DenitionMultimediaInterface(HDMI)connector,
andisHDCPcompliantallowingplaybackofHDDVD,Blu-ray,andotherprotected
content.
10.PS/2 keyboard (purple) port.ThisportisforaPS/2keyboard.
Audio2.1,4.1,5.1or7.1-channelconguration
Port Headset
2.1-channel 4.1-channel 5.1-channel 7.1-channel
LightBlue(Rearpanel) LineIn RearSpeakerOut RearSpeakerOut RearSpeakerOut
Lime(Rearpanel) LineOut FrontSpeakerOut FrontSpeakerOut FrontSpeakerOut
Pink(Rearpanel) MicIn MicIn Bass/Center Bass/Center
Lime(Frontpanel) - - - SideSpeakerOut
6. Line In port (light blue).Thisportconnectstothetape,CD,DVDplayer,orother
audiosources.
7. Line Out port (lime).Thisportconnectstoaheadphoneoraspeaker.Inthe4.1,
5.1and7.1-channelcongurations,thefunctionofthisportbecomesFrontSpeaker
Out.
8. Microphone port (pink).Thisportconnectstoamicrophone.
Refertotheaudiocongurationtableforthefunctionoftheaudioportsin2.1,4.1,5.1,or
7.1-channelconguration.

1-8 Chapter 1: Product introduction
Central Processing Unit (CPU)
ThemotherboardcomeswithanAMDAM4socketdesignedforAMD
Ryzen™/7thGenerationA-series/Athlon™processors.
UnplugallpowercablesbeforeinstallingtheCPU.
TheAM4sockethasadifferentpinoutfromtheFM2+/FM2socket.Ensurethatyouusea
CPUdesignedfortheAM4socket.TheCPUtsinonlyonecorrectorientation.DONOT
forcetheCPUintothesockettopreventbendingthepinsanddamagingtheCPU!
Installing the CPU
ApplytheThermalInterfaceMaterialtotheCPUheatsinkandCPUbeforeyouinstallthe
heatsinkandfanifnecessary.
1
3
2
4

ASUS PRIME A320M-K 1-9
System memory
Overview
ThismotherboardcomeswithtwoDoubleDataRate4(DDR4)DualInlineMemoryModule
(DIMM)sockets.ThegureillustratesthelocationoftheDDR4DIMMsockets:
• YoumayinstallvaryingmemorysizesinChannelAandChannelB.Thesystem
mapsthetotalsizeofthelower-sizedchannelforthedual-channelconguration.Any
excessmemoryfromthehigher-sizedchannelisthenmappedforsingle-channel
operation.
• AlwaysinstallDIMMswiththesameCASlatency.Foroptimalcompatibility,we
recommendthatyouinstallmemorymodulesofthesameversionordatecode(D/C)
fromthesamevendor.Checkwiththeretailertogetthecorrectmemorymodules.
Recommendedmemoryconguration
Channel Sockets
ChannelA DIMM_A1
ChannelB DIMM_B1
DIMM_A1
DIMM_B1
• Forsystemstability,useamoreefcientmemorycoolingsystemtosupportafull
memoryload(2DIMMs).
• Refertowww.asus.comforthelatestMemoryQVL(QualiedVendorsList)

1-10 Chapter 1: Product introduction
Installing a DIMM
12
To remove a DIMM
B
A
B
A
A

BIOS information
2
• ScantheQRcodetoviewtheBIOSupdateguide.
• BeforeusingtheASUSCrashFreeBIOS3utility,renamethe
BIOSleintheremovabledeviceintoPRA320MK.CAP.
BIOS setup program
UsetheBIOSSetupprogramtoupdatetheBIOSorcongureitsparameters.TheBIOS
screensincludenavigationkeysandbriefonlinehelptoguideyouinusingtheBIOSSetup
program.
Entering BIOS Setup at startup
To enter BIOS Setup at startup:
Press<Delete>or<F2>duringthePower-OnSelfTest(POST).Ifyoudonotpress<Delete>
or<F2>,POSTcontinueswithitsroutines.
Entering BIOS Setup after POST
To enter BIOS Setup after POST:
Press<Ctrl>+<Alt>+<Del>simultaneously.
Presstheresetbuttononthesystemchassis.
Pressthepowerbuttontoturnthesystemoffthenbackon.Dothisoptiononlyifyoufailedto
enterBIOSSetupusingthersttwooptions.
Usingthepowerbutton,resetbutton,orthe<Ctrl>+<Alt>+<Del>keystoforceresetfroma
runningoperatingsystemcancausedamagetoyourdataorsystem.Werecommendyou
alwaysshutdownthesystemproperlyfromtheoperatingsystem.
• TheBIOSsetupscreensshowninthissectionareforreferencepurposesonly,and
maynotexactlymatchwhatyouseeonyourscreen.
• VisittheASUSwebsiteatwww.asus.comtodownloadthelatestBIOSleforthis
motherboard.
• IfthesystembecomesunstableafterchanginganyBIOSsetting,loadthedefault
settingstoensuresystemcompatibilityandstability.SelecttheLoad Optimized
DefaultsitemundertheExitmenuorpresshotkeyF5.
• IfthesystemfailstobootafterchanginganyBIOSsetting,trytocleartheCMOSand
resetthemotherboardtothedefaultvalue.SeesectionMotherboard overviewfor
informationonhowtoerasetheRTCRAM.
BIOS menu screen
TheBIOSsetupprogramcanbeusedundertwomodes:EZ ModeandAdvanced Mode.
Press<F7>tochangebetweenthetwomodes.
ASUS PRIME A320M-K 2-1

EZ Mode
Bydefault,theEZModescreenappearswhenyouentertheBIOSsetupprogram.TheEZ
Modeprovidesyouanoverviewofthebasicsysteminformation,andallowsyoutoselectthe
displaylanguage,systemperformancemode,fanproleandbootdevicepriority.Toaccess
theAdvancedMode,clickAdvanced Mode(F7)orpress<F7>.
ThedefaultscreenforenteringtheBIOSsetupprogramcanbechanged.
Thebootdeviceoptionsvarydependingonthedevicesyouinstalledtothesystem.
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