IS IT?!? Whoops, my bad... Sorry
I'm not that well up on ATI... Last ATI card I owned was a RageII 3D, I think it had 4 or 8mb...

Was brilliant at the time, played carmageddon at max settings, back in 1995/96???
So Myers, disregard my previous post, lets see what we can do...
Post a dxdiag so I can check your bro's drivers over.
You say you know all the fps commands, but just check
CoD4 FPS tips and
Best Possible Computer Setup There may be some tweaks in either of those posts that you're currrently unaware of.