i have a 450 and its good, with my setting i get 70+ fps all the time exept in one world and sk where is drops to only 40 or something, mafia 2 on highest around 30-40 fps with everything on highest and 8x aa i think. gta 4 may suprise you with low fps but i think thats just me not playing on the latest patch, mw2 around 30-50 on max