What standard ATX motherboard is compatible with my processor ?

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As much as I hate having to repeat myself...

Assuming you want to run Windows, and that your current version is oem, you're going to have to buy another copy for the new machine.

Yes. Listen to him. Also since the builds start with 4Gb RAM you'll want 64bit Windows 7 to make use of it all (XP and other 32 bit OSs can only address 3Gb)