Asus PRIME X399-A [20/96] Chapter 1

Asus PRIME X399-A [20/96] Chapter 1
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Chapter 1: Product Introduction
Chapter 1
Memory congurations
Youmayinstall2GB,4GB,8GBand16GBunbufferedECCandnon-ECCDDR4DIMMs
intotheDIMMsockets.
• YoumayinstallvaryingmemorysizesinChannelA,ChannelB,ChannelC,and
ChannelD.Thesystemmapsthetotalsizeofthelower-sizedchannelforthequad
channelconguration.Anyexcessmemoryfromthehigher-sizedchannelisthen
mappedforsingle-channeloperation.
• ThismotherboarddoesnotsupportDIMMsmadeupof512Mb(64MB)chipsorless
(MemorychipcapacitycountsinMegabit,8Megabit/Mb=1Megabyte/MB).
• ThedefaultmemoryoperationfrequencyisdependentonitsSerialPresenceDetect
(SPD),whichisthestandardwayofaccessinginformationfromamemorymodule.
Underthedefaultstate,somememorymodulesforoverclockingmayoperateata
lowerfrequencythanthevendor-markedvalue.
• Forsystemstability,useamoreefcientmemorycoolingsystemtosupportafull
memoryload(8DIMMs)oroverclockingcondition.
• AlwaysinstalltheDIMMSwiththesameCASLatency.Foranoptimumcompatibility,
werecommendthatyouinstallmemorymodulesofthesameversionordatacode
(D/C)fromthesamevendor.Checkwiththevendortogetthecorrectmemory
modules.
• VisittheASUSwebsiteforthelatestQVL.

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