I've been having heat trouble with my water-cooled CPU lately (AMD FX 8150, CPU water cooler came with the processor). It's also started making this irregular crackling/clicking noise, which increases with frequency as more load is put on the CPU (Temp rises, too, of course). I need to find out what's causing this noise - is the CPU buggered? Is my cooler? Or could it be something else, like air in the thermal gel layer? So much as loading a game causes the computer to do an emergency shut down to stop the CPU exploding, so I desperately need to figure this out!