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Windows 7: Mixed memory in DG45ID 2 x 2GB and 2 x 4GB

21 May 2010   #1

Windows 7 Ultimate x64
Mixed memory in DG45ID 2 x 2GB and 2 x 4GB

I have just taken delivery of two 4GB sticks to add to my exisiting 2x2Gb sticks. BIOS shows 12GB total but Win 7 won't load.
RAM has been checked with Memtest 86 and is ok.
I've read that 2GB is 512k ram and 4GB is 1GB ram? Are they incompatible?
Fresh install won't run with both so I'm doign a fresh install with just the 2 x 4GB sticks.
Any ideas?

My System SpecsSystem Spec
21 May 2010   #2

Windows 7 Ultimate x64/x86 Windows 7 Pro x64/x86 Windows 7 Home Premium x64/x86

Your RAM should be matching sticks.

Such as corsair or all kingston.

The values can be different. Such as running 2 1gigs with 2 2gigs sticks.

But they should all be the same speed. Such as all DDR2800 or 1066

IF they are differnet "brands" that can cause problems faster then anything.
My System SpecsSystem Spec
21 May 2010   #3

Windows 7 Ultimate x64


Yes they are all the same Brand, OCZ

I have two 4GB OCZ Gold at 5-5-5 @ 1.8v and two 2GB OCZ Fatal1ty at 5-4-4 @2.1v
My System SpecsSystem Spec

21 May 2010   #4

Windows 8.1 Pro RTM x64

They may well be of the same brand, but they are sufficiently different enough so that they are incompatible with each other. Sorry.
My System SpecsSystem Spec

 Mixed memory in DG45ID 2 x 2GB and 2 x 4GB

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