If you have a Radeon X800 Pro VIVO it is most likely that you can flash the BIOS and turn into a X800 XT.
It achieved by first backing up your original X800 Pro VIVO BIOS and then flashing the BIOS with an X800 XT BIOS from Gigabyte which opens up the locked 4 remaining pipes and thus gives you 16 active pipes instead of 12 which is standard on the X800 Pro series.
After this it is time to flash your X800 Pro VIVO card with either standard ATi X800 XT BIOS or your backed up BIOS.
Since the new BIOS also increases the clockrate of the GPU and memory to those of an X800 XT card most users choose do a rollback to their orginal BIOS and then apply some sort of extra cooling before attempting to overclock. The neat thing is that you get to keep the 16 active pipes
Read more about how it's done, which cards are supported and the downloads needed here: http://www.rage3d.com/board/showthread.php?t=33766704
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