with my voodoo 3 2000, ive removed the original heatsink, scrapped off all that solid glue stuff (with isnt thermally conductive...for some stupid reason its there) and then i put on a bit of thermal compound, and 4 dabs of superglue ..one in each corner, then i attached a 486 heatsink....quite big...then attached a 486 heatsink fan and can now run it at 172mhz....thats good for mine cos b4 it would only get to 167 before messing up.....some people have better cards from a better batch, and by carrying out what i have, you may be able to reach 190-200mhz.....its not impossible and ive heard of it been done....good luck!