LGA1366 i7 950 @3.07GHz, 6gigs of RAM in tripple channel and a GTX650Ti video card, runs Ridge Racer fine, and will run 13 or 14 instances of Nebula Model 2 (with a Daytona link and various other games ) all at once with no slowdown, provided nothing else runs with those 14...
LGA2011 i7 4820 @3.7GHz with 32gigs of RAM in quad channel and a GTX760 video card with easily run everything, i got to 23 instances of Nebula, Tekken 2 on Zinc, and a bluray disc playing before i got sick of it.
Windows 7 x64 on both. Hard to believe i built that top one over 5 years ago and its still more than i expected, changed video card last year cause they are so cheap now.