Asus TUF Z270 MARK 2 [23/98] Onboard buttons and switches

ASUS TUF Z270 MARK 2

1-9

Chapter 1

1.1.6 Onboard buttons and switches

Onboardbuttonsandswitchesallowyoutone-tuneperformancewhenworkingonabareor

open-casesystem.Thisisidealforoverclockersandgamerswhocontinuallychangesettings

toenhancesystemperformance.

1. MemOK! button

InstallingDIMMsthatarenotcompatiblewiththemotherboardmaycausesystemboot

failure.IfthesystemfailstobootduringPOSTstageandtheDRAM_LEDnearthe

MemOK!buttonlightscontinuously,presstheMemOK!buttonuntiltheDRAM_LED

startsblinking.Systemwillbeginautomaticmemorycompatibilitytuningandrebootfor

successfulboot.

• Refertosection1.1.8 Onboard LEDsfortheexactlocationoftheDRAM_LED.

• TheDRAM_LEDalsolightsupwhentheDIMMisnotproperlyinstalled.Turnoffthe

systemandreinstalltheDIMMbeforeusingtheMemOK!function.

• TheMemOK!buttondoesnotfunctionunderWindows

OSenvironment.

• Duringthetuningprocess,thesystemloadsandtestsfailsafememorysettings.It

takesabout30secondsforthesystemtotestonesetoffailsafesettings.Ifthetest

fails,thesystemrebootsandteststhenextsetoffailsafesettings.Theblinkingspeed

oftheDRAM_LEDincreases,indicatingdifferenttestprocesses.

• Duetomemorytuningrequirement,thesystemautomaticallyrebootswheneach

timingsetistested.IftheinstalledDIMMsstillfailtobootafterthewholetuning

process,theDRAM_LEDlightscontinuously.ReplacetheDIMMswithones

recommendedintheMemoryQVL(QualiedVendorsLists)atwww.asus.com.

• IfyouturnoffthecomputerandreplaceDIMMsduringthetuningprocess,thesystem

continuesmemorytuningafterturningonthecomputer.Tostopmemorytuning,turn

offthecomputerandunplugthepowercordforabout5–10seconds.

• IfyoursystemfailstobootupduetoBIOSoverclocking,presstheMemOK!button

tobootandloadtheBIOSdefaultsettings.AmessagewillappearduringPOST

remindingyouthattheBIOShasbeenrestoredtoitsdefaultsettings.

• WerecommendthatyoudownloadandupdatetothelatestBIOSversionfrom

www.asus.comafterusingtheMemOK!function.