I thought you guys would find this interesting. My faulty northbridge fan was pissing me off, and as long as I was inside the case messing with my video card today I thought I'd take it out and clean it up a bit. A few sprays of canned air, and two drops of sewing machine oil, and I screwed it back in. My CPU under full load is now 46C! Before it would idle as high as 50-52C! I have no idea what I did, but I'm glad I did it.