hi runmc,

first check if u got the 256bit or the 512bit mem interface version of the 2900pro. if u got the 512bit version u can use QuantumForce2900Editor.exe (just google for it, i think techpowerup has got it up) to modify the bios of ur 2900pro. u can also read thru the 40+ pages of this thread to find some modded bioses. but it´s easier to just dump the bios off one of ur cards with atiflash and then edit it with the quantumforce2900editor. just set the 3d gpu and vram clocks u want and voltage (goes up to 1.35v in bios).