just to let the people know that are thinking of getting a x800 pro,make sure u get 1 with the vivo installed as these cards are basically xt cards with the 4 pipelines disabled in the bios, I just reflashed my powercolor pro to the gigabyte xt bios and unlocked the 16 pipes then re-flashed back to original bios so now i have a pro with 16 pipes, quite a big performance leap enabling the extra pipes 
Although why bother flashing back to the old bios anyway? Just leave at the XT bios and if your card can't handle the clocks drop it down slightly 