That looks ok at 100% load?
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Actually it probably should be more like low 40s with a Vendetta according to what other people on the internet seem to have with it overclocked. Maybe you need to clean some dust out of the case fans and HSF?
I've been putting off clearing the dust out :(
Woops, my temps were 10c too high because I didn't offset the TjMax by -10, for Q6600s it's actually 90.
http://i36.tinypic.com/spzuxu.png