My specs. I typically run at a constant 200fps on LFS with settings maxed, and hover around 40-60 on more "modern" games at medium graphics.
Asus P5VE HDMI Mobo, Rosewill 750M PSU, Intel Core 2 Quad Q9550@2.85ghz, Rosewill RCX-ZAIO-92 CPU Cooler, ATI Radeon HD6670, 2x Seagate ST1000DM003 (RAID1) and a random Samsung Blu-Ray drive... All wrapped up in a HP Pavillion Elite case that I rattlecanned to be all black.