My PC has an AMD Athlon II X4 635 2.9 Ghz Processor and has a Palit GTS 250 E-GREEN 1gb DDR3
4 Gig of DDR2 ram and Windows 7 Ultimate 32-bit OS. Monitor is 1280 x 1024
I can play GTA IV at a decent settings (Better than Consoles) Crysis 2 on Advanced Settings (Medium) Assassins Creed 2 at high settings no AA (Lags on some place) Skyrim on High Settings High Settings (4X AA). Just Cause 2 on High Settings 2X AA (Frame Rate is very unstable, I don't think it's because of my hardware).
So basically I can run games slightly higher than their (Console Equivalent Settings).