Custom drivers?

Hello, I've been out of the scene for quite a while so I've lsot track of things. Right now I'm running a Macbook Pro and using bootcamp for Windows XP. Anyway I can overclock the gfx card Ati x1600 Mobility using ATI tray tools using the Omega Drivers, but sadly the last Omega drivers are VERY old. Are there any other sources for new unnofficial drivers that will let me overclock? I really want to play Bioshock and I think my old drivers are limiting me a lot. I would get the new ones, but then I lose a substantial clock. I can overclock nearly double the stock speed on this laptop.

Any point in the right direction is gladly appreciated.

Thanks

Do a search for Big_Sam over at XTremeSystems, haven't been over there in a while but he helped me out with some hacked SLI drivers a while back. http://www.xtremesystems.org/forums/forumdisplay.php?f=64