If you go with the NewerTech CPU upgrade it comes with its own heatsink, so you wouldn't need to worry about a replacement if you go that route.
But the other concern I see when looking at this is the the shape of it. I think (though I could be wrong) that the Quicksilver CPU board might not fit into this screw arrangement. The PPC CPU board may be to different to fit on this. What are the dimmensions of the QS CPU board screw posts?
Have you overclocked your QS? Is that why you are looking for the extra cooling? How hot is it running usually?
Simplicity is the ultimate sophistication.
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