I use a AMD Phenom II X4 925 (that or 920, don't remember) with 4GB DDR 3 ram (dual chanel), an asus MB (don't remember the name) and a GTX 460 756mb SLI. I'd say i can run the game on high 98-99% of the time w/o lag (even if i'm not using SLI). I think it took around 500-600 dollars to build (without the extra graphics card). I can check on what everything actually is if ye want