SVC.com has the largest variety
of CPU, VGA/GPU, and chipset waterblocks. A VGA Water block is the watercooling
equivalent of a heatsink for your graphics card. It consists of at least two
parts made of either aluminum or copper which join together to form a "block"
with a channel running through it. Its an ideal cooling solution if your
overclocking your graphics card, or just want silent and dependable cooling.
VGA Water Blocks 
