But neither of them will play assassin's creed beyond 1024 or 1280 with low graphics
if this is not a laptop you are buying i suggest an 4670 for $65 or a 9600 GT for $85 or even 4830 for $95 (the latest will play assasins creed with good details up to 1280x1024 or up to 1680 with lowered details)