If you didn't see my thread in general computer forums about my high cpu temps.. here another warning about the scythe ninja heatsink
Basically the clips on my scythe ninja (plus rev.b) when fully "locked" (if you can call it that) did not securely hold the heatsink flush againgst the processor .. or at very least with inadequate pressure. This lead to high temps from my cpu and i ended up making a mounting system with some nuts and bolts to hold it in place
Also the fan is insufficent for dealing with high temperature generated by the new quad core chips.
Basically the performance of my scythe ninja is within 7c of the stock fan (almost 10c hotter with the faulty pegs) ... and in my opinion not worth it.. buy something else