well after trying various BIOSs today, and testing at different speeds, i've found that i can't get my card to function properly with an XT BIOS at all, even if its XT clocked at 500/500.
using a Pro BIOS, it works when its overclocked to XTPE speeds (520/560)
it also works with a Pro BIOS with 16 pipelines enabled and overclocked to XTPE speeds
it just always crashes if it has an XT BIOS, no matter what speed it is set at.
so it is just a case of some Pro VIVO cards being able to cope with the XTPE speeds and some not? is it just the luck of the draw?
if so, roughly what proportion of Pro VIVO cards can run at XTPE? are we talking about most of them, or very few? also, does it depend on manufacturer? for eg. do you stand a better chance of getting a card capable of XTPE speeds if its made by ATI that if it was made by Sapphire?
i guess what im asking is, it it worth me buying another X800 Pro VIVO to see if i can get one that can manage XTPE speeds?