a gtx260 or hd4870 will curbstomp a gpu in the ps3 or xbxo 360. But, games for consoles get optimized far better then for the PC. So a console might only need a 7800gt to give you x amount of graphics, where a pc might need a 8800gt for that. So you can't directly compare them just like that. But, if you look at a game like stalker: clear sky, and the graphics it produces ( needing a gtx260 or better or your fps will be crap ) you will conclude that no console game can even come close to that. And, pc games often use higher res textures.