questionswindows 7 rc upgrade

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You don't need Windows 7 Ultimate to run 8 GB of RAM, you need to get a 64 bit copy of Windows for that. All versions except basic come in 64 bit versions, so just pick yourself up a copy of Home Premium 64 and you should be good.

You just need to buy an upgrade copy according to Microsoft: http://www.microsoft.com/windows/windows-7/get/release-candidate.aspx

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What @catbertthegreat said. I'm running 8GB of RAM on Win7 Home Premium 64bit.

BTW - I got it for $50 shipped by pre-ordering last year a few months before the official release. Not that that information helps you right now, I'm just gloating. ;-P

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Tiger Direct or Amazon has it for around $100.