They are 10 bucks for a set of 4. You'll need two sets (of course) and some good thermal epoxy. I would not use the tape. I used the Artic Silver ceramic epoxy since its not conductive. I would hate for you to burn out your ram because some ooozed out onto the leads. I have had three of the cards the first one died after I did the pencil trick to up the voltage on the ram. It didt like it and I had to remove the epoxied ramsinks. Damn it wasnt easy but they did come off with some effort annd after some serious cleaning I bought a retail card from Fry's and returned the dead card 2 hrs later for a refund
All I did really was expidite the swap and eliminate the shipping charges
Anyway the two 8500's I have are great. Not one problem in any game at all. Ghost Recon, Giants, Jedi Knight II, Global Ops, MOHAA, NFS5 etc. Man MOHAA and JediII both run 1600x1200 32 bit color and textures all details cranked and the lowest FPS I saw in MOHAA was 45; In JediII the lowest was 69 fps! Who needs Anti A at 1600x1200?
The ram sinks are worth it the highest I could get on the ram before was right under 600 now I get 640. Woohoo.
Doh! Here's where you can get them.