Letse see... CSS = 1024x768, all details maxed, full HDR, no AA, 16xAF, 80+fps most of the time.. drops to around 35 for me in fire fights.
HL2 = same as css only no HDR (dosen't have it >_<) but 4xAA, 80+fps the whole time unless things get heavy.
Halo = 1024x768, details maxed, 16xAF, 80+fps even in the covenant ships with pixel shaders everywhere. RARELY goes below 60fps.
UT2k4 = 1024x768, all details maxed, no AA, 16x AF, like freaking 200 fps in most death match games lol. Only gets down like 40 in onslaught or assault..
So uhh yeah, that 7600GT will rips those games in half.