Thanks Zotty for input. It's a Corsair HX750. The reason for my op is that I'm going to take my pc to India and leave it there for use during my summer holidays (live in UK). The room where my pc wil be staying has no air conditioning so it can get hot. I'm only going to be using it for basic computing so load wise the fan shouldn't come on. I would like the fan to come on though if the temp goes up.