Well on my system(3.6ghz cpu, 2gb ram, hd4850, win xp) it doesnt make any difference. I made a rough comparison some time ago based on that system(only with cpu clocked at 3.3ghz), so if you want than have a look at my first post in that thread: http://www.tomshardware.co.uk/forum/page-257355_12_0.html