VapoChill Micro CPU cooler
 

I think you could squeeze a few more MHz from your CPU without any overheating issues, that is if you are using the extreme or high end versions of course as I don’t think the Ultra Silent would be up to that task as it struggles to the CPU under 30. Although this is not a problem and your CPU and can run upwards of 50-60C without any stability issues a stock cooler gives you about the same results at a third of the price but I must mention that this is near silent so you have to make a compromise somewhere down the line price for noise of vice versa.

Link: http://www.xtremecomputing.co.uk/review.php?id=219