DDR3-1066MHz vs. DDR3-1333MHz RAM?

The only difference between the two is maximum memory bandwith: hypothetically, dual channel 1333mhz ram has 21gb/s memory bandwidth compared to ... FrontPage Roundups Guides HowTos Reviews Buyer'sGuide Forums Login Register Sidebar Sidebar test Home Newposts WikiPost Support Sidebar Sidebar BecomeaMacRumorsSupporterfor$50/yearwithnoads,abilitytofilterfrontpagestories,andprivateforums. Menu Installtheapp Install DDR3-1066MHzvs.DDR3-1333MHzRAM? Threadstarter Crunch Startdate Jul27,2010 Sortbyreactionscore Forums Macs Desktops iMac Youareusinganoutofdatebrowser.Itmaynotdisplaythisorotherwebsitescorrectly.Youshouldupgradeoruseanalternativebrowser. Crunch macrumors6502a Originalposter Jun26,2008 701 76 CrazyL.A. I'vehadmy21.5"for21/2weeksandnowIwanttoupgrade.It'sthehigher-endonewiththeATI4650HDcardandthe1TBdrive.DoIhaveashot?Ijustpassedthe14-dayreturnwindow.Idefinitelywanttoupgradetoeitherthenew21.5"higher-endoneor,foranextra$200,gowiththelower-end27"... Bytheway,FYI,Ihave16GBofDDR3-1066RAM.SomeofyoumayhaveaddedRAMaswellsoIcheckedthatoutaswell:ALLfourmodelswithALLofitsbaseandupgradableprocessorssupportBOTH1066MHzand1333MHzDDR3RAM. Howmuchofadifferencebetweenthetwospeedswillbenoticeable?Icouldjustsellallfourofmy4GBDDR3-1066chips(allNEW!Grrr...)andthenbuyDDR3-1333's...Whatapain... Anyrecommendations?   TMRaven macrumors68020 Nov5,2009 2,099 1 Theonlydifferencebetweenthetwoismaximummemorybandwith: hypothetically,dualchannel1333mhzramhas21gb/smemorybandwidthcomparedtodualchannel's1066mzh,whichisratedat17gb/smemorybandwidth.Onlyaselectfewtaskswilltakeadvantageofthatamountofmemorybandwidth,andthedifferenceprobablywon'tbesignificantlynoticeable.   Sneakz macrumors65816 Jul17,2008 1,213 321 Toronto,Ontario,Canada 1333MHzhashigherlatency,butagainitsnotnoticeable.   Crunch macrumors6502a Originalposter Jun26,2008 701 76 CrazyL.A. Bytheway,doestheCPUalwaysdictateastowhattypeofRAMmustgointowhatevercomputer,orisitacombinationofthechipsetandtheCPU?   V volunteer1995 macrumorsnewbie Aug11,2010 2 0 DDR3-1066MHzvs.DDR3-1333MHzRAMfornon-experts. Gentlemen, Youguysseemprettysmartonthis.IjustboughtmyfirstiMac(21.5"3.06...).Ithas4GBofRAMandIwantedtoupgradeitbyadding8GBmore.OfcourseafterIorder8GBofPC3-8500(1066mhz)RAM,IrealizedthattheiMacIhavehas1333mhzinstalled.Willaddingthe8GBof1066mhzRAMincreasethespeedofmymachineorslowitdown?Idon'tuseitforanythingintenselikegaming,justphotoandvideoprocessing.Isitworthaddingtheextra8GBifits1066mhz?Thanksforthehelp.   xraydoc macrumorsdemi-god Oct9,2005 9,231 3,555 192.168.1.1 volunteer1995said: Gentlemen, Youguysseemprettysmartonthis.IjustboughtmyfirstiMac(21.5"3.06...).Ithas4GBofRAMandIwantedtoupgradeitbyadding8GBmore.OfcourseafterIorder8GBofPC3-8500(1066mhz)RAM,IrealizedthattheiMacIhavehas1333mhzinstalled.Willaddingthe8GBof1066mhzRAMincreasethespeedofmymachineorslowitdown?Idon'tuseitforanythingintenselikegaming,justphotoandvideoprocessing.Isitworthaddingtheextra8GBifits1066mhz?Thanksforthehelp. Clicktoexpand... Forspeedandreliability,allRAMshouldbeofthesametype. Ifyouputin1066MHzRAM(andyourmachineexpects1333MHz),oneoftwothingswillhappen.EitheralltheRAMwillslowtomatchtheslowestmoduleinthemachine,oryou'llhavesystemcrashesrelatedtothemismatchedRAM. Idon'tthinkthere'smuchofapricedifference;stickwithwhatApplespecifiesforyourmachine.CheckoutCrucial.com-theyhaveanonlineconfigurator...justtellitwhichMacyouhaveandit'llshowyouonlythecompatiblememorychoices.   D dexthageek macrumors6502 Dec7,2007 391 0 MakesureyougettheRAMforyourmachine. 2010iMac:PC-10600(1333Mhz) 2009iMac:PC-8500(1066Mhz) IfyouinstallPC-8500ina2010iMacitwillcauseyourcurrentRAMtodropdowntothesamespeed,itmayevencausesomeperformanceissuesormakethesystemcrashattimes. The2009iMacdoesnotsupportPC-10600soitwill(ifitworksatall)willdropdowntoPC-8500speeds.OntopofthatPC-10600ismoreexpensivesoitsnotwortheventryingit. Theeasiestwaytomakesurethingsrunsmoothlyistogetallmatchingspecs. Differentbrandsareok(trytoatleastkeepmatchedpairs). 2010iMac:PC-10600(1333Mhz)CL9 2009iMac:PC-8500(1066Mhz)CL7   Crunch macrumors6502a Originalposter Jun26,2008 701 76 CrazyL.A. No,thecorrectansweristhatitdoesnotmatter.YoucanmixRAMofbothspeeds(1066/1333).Thesystemwillautomaticallyusetheslowerspeed,butthereisnoriskofsystemcrashes.Andno,1333MHzRAMwillnotberecognizedina2009iMac,but1066MHzinthe2010isjustfine.   Hellhammer Moderatoremeritus Dec10,2008 22,164 581 Finland Crunchsaid: Andno,1333MHzRAMwillnotberecognizedina2009iMac,but1066MHzinthe2010isjustfine. Clicktoexpand... Youcanuse1333MHzin2009i5andi7iMac   bolen macrumors6502 Jul22,2008 351 0 Sweden Hellhammersaid: Youcanuse1333MHzin2009i5andi7iMac Clicktoexpand... aslongasyoureplacethealreadypresent1066MhzRAMwith1333Mhz.Otherwisethe1333Mhzstickswillbedegradedto1066Mhzaswell.   Crunch macrumors6502a Originalposter Jun26,2008 701 76 CrazyL.A. Hellhammersaid: Youcanuse1333MHzin2009i5andi7iMac Clicktoexpand... Istandcorrected.That'sright.Lookingatthe2009modelsalittlecloser,youcanalsouse1333MHzRAMwiththeCore2Duo3.33GHz,whichisanupgradeoptiononallnon-quadmodels.   J joefee macrumorsnewbie Aug22,2010 2 0 Appletechsupportsaysyoucannotput1333MHzina2009MPrunningat1066. Hasanyoneactually(orknowofsomeone)whotriedtobut1333memory3x4GBor4x4GBina2009MP(mineisaOne2.66GHzQuad-CoreIntelXeon"Nehalem"processor).Readingthisthread,itseemsthatnodamagewilloccuranditeitherwon'trunoritwillrunatminimum1066clockspeed?????? Iwasabletoget2kitsCorsairXMS3,DDR3,1333MHz4GBX4(16BGtotal)9-9-9-241.5VUNBUFFERED,240PIN,NON-ECC,SDRAM(#CMX8GX3M2A1333C9)atFRYsfor$200eachbutIdonotwanttoopenthepackageunlessIgetfirmopinionthatitwillwork. Mylogicatthisprice:IcanholdontothememoryformynextMPrunningthesame1333MHzmemory.HELP,Ionlyhave2weekstoreturnthememory!!!   J joefee macrumorsnewbie Aug22,2010 2 0 CalledCorsairandthey,likeappletechsupportdonotrecommendnon-eccmodules.   D Detrius macrumors68000 Sep10,2008 1,623 19 Apex,NC joefeesaid: Iwasabletoget2kitsCorsairXMS3,DDR3,1333MHz4GBX4(16BGtotal)9-9-9-241.5VUNBUFFERED,240PIN,NON-ECC,SDRAM(#CMX8GX3M2A1333C9)atFRYsfor$200eachbutIdonotwanttoopenthepackageunlessIgetfirmopinionthatitwillwork. Clicktoexpand... First,thisthreadisasboutiMacs--NOTMacPros. Second,ifyourmachinesupportsECC,thenfortheloveofthespaghettimonster,GETECCMEMORY!!!ECC=ErrorCorrectingCode.Thatis,iftheRAMevermessesup,thecomputerwillknowit,andinsteadofcrashingorcorruptingyourdata,itwillfixit.   MrXiro macrumors68040 Nov2,2007 3,850 599 LosAngeles Thisisoldnow...butIjustdidthistoday...worksfine...itdownclocksyourRAMto1066...otherwisenoilleffects...mycomputerisa********fasterthoughatloading.   AlienSexGod macrumorsmember Mar18,2008 93 2 MrXirosaid: Thisisoldnow...butIjustdidthistoday...worksfine...itdownclocksyourRAMto1066...otherwisenoilleffects...mycomputerisa********fasterthoughatloading. Clicktoexpand... Interestingyouhavefasterloadtime...that'sprobablythelatency. 1066MhzDDR3sodimmsthatareMaccompatibleMUSTbeclass7lowlatency all1333MhzsodimmsthatIhaveseemaremuchslowerlatencyCLass9buttheywillrunthefasterlatency(Class7)whenclockeddownto1066.7Mhz   Lastedited:May31,2011 Crunch macrumors6502a Originalposter Jun26,2008 701 76 CrazyL.A. MrXirosaid: Thisisoldnow...butIjustdidthistoday...worksfine...itdownclocksyourRAMto1066...otherwisenoilleffects...mycomputerisa********fasterthoughatloading. Clicktoexpand... Getout.Really?Areyoucomparing'sto's? YousayyouchangedONLYtheRAMintheSAMEmachinethattakes1333MHz?Whatcomputerdidyoudothison?   Youmustloginorregistertoreplyhere. Share: Facebook Twitter Reddit Email Share Link RegisteronMacRumors!Thissidebarwillgoaway,andyou'llseefewerads. SignUp Forums Macs Desktops iMac Top Bottom