I have installed the TTC-CUV2AB on my northbridge. I also couldn't install a Zalman passive heatsink because my slk900 hangs over my northbridge.

The Titan cooler is rather silent and moves a rather great amount of air. Haven't overclocked yet. In a while I'll try to let the Titan fan run at 7V to reduce the noise even more.

Here's the site of Titan.
http://www.titan-cd.com/english/prod...TTC-CUV2AB/DIY

I bought my TTC-CUV2AB new on ebay.be. There are still auctions, you should have a look.

Greetz