Well, 6.2 didn't help me.
Dell 3GHz HT
ATi X700 PCIE
2.5G RAM
After installing just the drivers, I got 75FPS (I use screen sync)... for a while. Then it tanked after playing for a little while. It would also slow way down and stutter for no apparent reason. I was getting 40-60FPS.
I tried the OMEGA drivers, and frankly, they were worse. I kept the tools installed for checking temps and all that, but if it is running, LFS will not start.
Anyway, I switched back to 5.11 and my frames are back to 60-75. This is with 4x AA and 16x AF, full quality settings.