it works for slower cpu's (under 2.0ghz) and only with a 256mb video card .
AE my 1.3 ghz 512 ram , with a 9550 256 card has textures preloaded into video it gets 30-80 fps it plays very nice this way
my 2.4ghz 512, 9600pro 128 worked losy with textures preloaded into memory .. just running it normal without any preloads it avg's 35-85 fps and the ingame sliders are alittle below what the lesser pc is set at ( around 1/2 way ) with all the eye candy turned on .