"They are worth the investment because they will extend the life of your graphics card in your system. The results speak for themselves, especially seeing such a high jump in 3D Mark 2000, almost 600 3D Marks just by overclocking the core/memory clock speeds. So what are you waiting for? Go get them!!"
FULL STORY @ OCWORKBENCH (http://www.ocworkbench.com/hardware/memsinks/ocgts.htm)