User's Manual

ASUS A58M-A/USB3
1-7
1.4 System memory
1.4.1 Overview
ThemotherboardcomeswithtwoDoubleDataRate3(DDR3)DualInlineMemoryModules
(DIMM)sockets.
ADDR3modulehasthesamephysicaldimensionsasaDDR2DIMMbutisnotched
differentlytopreventinstallationonaDDR2DIMMsocket.DDR3modulesaredevelopedfor
better performance with less power consumption.
ThegureillustratesthelocationoftheDDR3DIMMsockets:
Channel Sockets
ChannelA DIMM_A1
ChannelB DIMM_B1
A58M-A/USB3 240-pin DDR3 DIMM sockets
DIMM_A1 DIMM_B1
A58M-A/USB3
1.4.2 Memory configurations
Youmayinstall1GB,2GB,4GB,and8GBunbufferednon-ECCDDR3DIMMsintothe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.
• Duetothememoryaddresslimitationon32-bitWindows
®
OS,whenyouinstall4GB
ormorememoryonthemotherboard,theactualusablememoryfortheOScanbe
about3GBorless.Foreffectiveuseofmemory,werecommendthatyoudoanyofthe
following:
 - Installamaximumof3GBsystemmemoryifyouareusinga32-bitWindows®
 OS.
- Usea64-bitWindows
®
OSifyouwanttoinstall4GBormorememoryonthe
motherboard.
• ThismotherboarddoesnotsupportDIMMsmadeupof512Mb(64MB)chipsorless.
• Themaximum32GBmemorycapacitycanbesupportedwith16GBoraboveDIMMs.
ASUSwillupdatethememoryQVLoncetheDIMMsareavailableinthemarket.