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05 Oct 2010  
DeaconFrost

Windows 7 Ultimate x64 SP1
 
 

The PSU has nothing to do with the OS, so that would be fine. The memory...not so simple of a question, for two reasons:

1. I've often tripped activation by swapping memory. You wouldn't have to reinstall, but be prepared to reactivate.
2. If you have a 32 bit OS installed now, and you add enough memory to equal or exceed 4 GB, you won't be able to use it all, and should consider installing an x64 OS.
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