for real dude the least you could do before asking. -nice tone of voice here-
read blade runner's articles on watercooling the R300 and Geforce4 ti 4600 and you'll get the gist!
For the those that are ****ing lazy to click a few links:
http://www.deviantpc.com/articles/gf4wcp1/p4.shtml
P.S. i am sorry if I sound like i am angry, I am a nice guy, really!