Not a clue I'm afraid. The PCs running the sea battle I played were using 620W Corsair PSUs (that red sticker is a giveaway!) but then we had to play in windowed mode, and you could easily run a quad-core CPU and hefty graphics card from one of those anyway. I'm guessing it'll be fairly tough to run just because every other Total War games have been at launch. I'd guees it'll be CPU-hungry as well as GPU but this is all conjecture based on previous games. Probably wont see system specs until after Christmas as the game is due beginning of Feb.