Danger Den Maze 5 GPU waterblock
 

The Danger Den Maze 5 is a waterblock that fits most ATI and NVIDIA video cards. It is engineered for optimum performance and flow rate. Danger Den has years of experience in designing water blocks, which you can see in this product. In our testing we saw an increase of maximum stable GPU clock by over 70 MHz compared to the ATI stock cooler.

http://www.techpowerup.com/reviews/DangerDen/Maze5