It's a pcToys QuietMaxx 5700 Socket 478 Heatsink and Fan. It had a blower tube on it to force air to the rear case fan, and out. However, it didn't fit in my case, so I took it off. I can get it to run at ~3,500 rpm via my mobo software settings.
As far as installation, it is possible I don't have it seated correctly. Additionally, I used the grease that came with it and should have probably used this Arctic 5 stuff I've been reading about.
Do you know of an kick butt CPU fans? What about 120mm case fans?
Other factors my work buddies pointed out ... my system is in the hottest room in my house due to the way the sun rotates around my house, and it's usually around 75F. The biggie, is that it sits in on one of those cubby holes in a deks with a PC slot. However, it's 75% open and totally enclosed. But, I'm aware that it should probably be out in the open entirely.
A northwood shouldn't be anywhere near that hot. I've got a email@example.com and I'm at 35 full load with fan at about 3000. I'm wondering if your temp sensor is boogered up. Do you feel heat blasting out of the case? I bet you could run it fanless and have better temps. I would definately try reseting the heatsink to see what happens.