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05 Oct 2009  

Windows 7 Ultimate x64 SP1

The fact that you had to underclock the memory to run memtest tells you there is something wonky between the board and memory, even if it is a known issue. You could quickly download a x64 version of Ubuntu and give that a shot as well.

Check your BIOS for a memory mapping feature, or some other option that needs to be enabled for all 4 GB to be recognized. If that's not the solution, or not an option, I'd be thinking of replacing the board or memory, if I was my system.
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