Don't get an 8400GS. It sucks ass and in the only way it's better than the old 9600PRO you have is it's DX10. Don't expect to run ANY DX10 games on medium or high. Also, pentium dual core is ultra fail.
Pentium D processors are not "ultra fail". They are actually pretty good, just not in comparison to the new Core 2 Duo processors. If his is indeed overclocked (not underclocked Xet, don't get those two mixed up) it should suit him fine for another year or so.
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