I've got a very wierd problem with my HIS X800Pro. It makes some kind of clicking noise och cracking noise. BUT...when I turn up the fan to 100% with ATI tool, the cracking noise stops. Same thing happens when I'm dropping the fan to 0%. So I thought that it could be the fan which were broken, and so I changed it with the Arctic Cooler ATI silencer 4, which is the exakt same reference fan that the HIS card uses. A new fan/heatsink, but the noise still remains. And nothing at 100% or 0%. I don't wanna have the fan on 100% all the time because it is making some noise. But ether way it is giving me noise. Anyone how know what the problem is or having the same kind of problem?