http://www.bit-tech.net/hardware/cooling/2010/05/19/graphics-card-coolers-investigated/7
Enjoy.
Enjoy.
From the results of our testing, it’s clear that third-party graphics card coolers are somewhat of a mixed bag and it's very hard to get yourself a good buy.
One sweeping generalisation we can make is that none of the coolers worth buying were particularly easy to fit. The coolers we tested ranged from the fiddly to the downright destructive - Arctic Cooling in particular is responsible for making several HSFs that are as finger shredding as those wall-of-notes Scandinavian metal songs that plague the latter levels of Guitar Hero games.
Think before taking your graphics card to bits; the stock HSF is a better option than many third-party models. As such, cooler manufacturers of the world, take note - there's a big gap in the market for a sensibly priced, easy to fit cooler that outperforms the Nvidia and ATI stock coolers. In the meantime, if you do want to replace your graphics card's cooler, tread carefully.