The screenshots that are currently on the net from Geforce 8800 dual-core systems running in full HD (1080p). the target is to have it run on 7800 cards. Because the game also runs on an Xbox360, it's more optimized than if it only had been a PC game. A 360 game has to be able to run from DVD using only 512Mb, so the benefits for the PC version are clear.
