I might be wrong on this (can't really remember), but I'm using the Q3 compatible drivers with the OLD openGL/MiniGL (1.47) with SLI to get just as high frame rates.
Also, not many people know that if you put your monitor refresh rates up to 120Hz for whatever res you are using, it increases your FPS by about 40% over 85Hz, since there is less waiting for the vertical blank of your monitor.
HOWEVER DON'T DO THIS IF YOUR MONITOR CAN'T HANDLE IT!
The alternative is turn off waiting for vertical blanking (VSYNC).