My sc2 is making a loud hissing noise out of one fan only. only at high loads does it do this and by high loads I mean a fast spinning fan -- it is loud. I know its this one fan because ill stop it with my hand and the hissing noise will go away. I took the fan off and took it apart, then greased the bearings but it still does this. The only thing I can think of is its the spring inside the fan that goes between the fan and the gpu (this spring is inside the fan assembly.) I may go in and re-position the spring. any suggestions?...any advice on what this loud hissing noise is is much appreciated.