/diy/ - Do It Yourself

Hi there.
I'm going to try to put a new GPU fan on my video card.
It's ATI Radeon 5700 and the fan makes annoying grinding noises and doesn't seem to reach the speed it's supposed to anymore. It's barely making noise now at 25% speed (I'm watching the temperatures don't freak out) but I need a new one.

I don't know much about the subject or exactly what kind of fan is in there but I assume that with the right fan I could do it.

I'm thinking of keeping the heatsink and only replacing the fan itself but that would probably require me to find a more specific type of fan.

Soooo, do you think I should buy an aftermarket cooling set or a fan that fits right in there?
Also, where can I figure out what fan I need? I found a fan on ebay that looked like it's exactly the same.