Thus far I'm finding I can still do my best clocks with my setup with f5d. This isn't to say the f6a is terrible, works fine, very stable, just wouldn't seem to let me push as hard. Who knows, if I put the other ram in maybe I'd get different results. The thing is my 790i pukes on the ocz flex xlc so it looks like those stay in the x48t. Uploaded for anyone who'd like to give it a shot. http://lakesidepc.com/X48TDQ6.F6A