I tested out DMC 4 maxed at 1920x1080 8xaa16xaf with the 5870 and my stock clocked i7 965 and got the following
scene 1 162.78
scene 2 123.86
scene 3 221.67
scene 4 118.59

Ran it twice and got pretty much identical numbers, i think these are higher than the ones amd posted on their graphs. Anyway Im sticking to things i can easily dl and benchmark as I dont have much installed right now, so if there are any other games like RE5 and DMC4 which have a demo/benchmark you can dl and run LMK and I'll try to run it for u.