source replacement heatsink/fans for GPUs, but with these custom-designed form factors from the HD 78xx and 7xx cards, I don't know if it's viable anymore. Is it?
I had a pretty easy time finding a replacement fan on Ebay for an XFX 5830
a couple months ago. YMMV, this particular card's fan that was screwed onto the heatsink. Once the fan was removed, I Googled the model # on the back of the fan and presto!
If all else fails, you can always remove the heatsink shroud and zip-tie/twist-tie some 80mm case fans to the heatsink...I may or may not have done that before
Main: i5-3570K, ASRock Z77 Pro4-M, MSI RX480 8G, 500GB Crucial BX100, 2 TB Samsung EcoGreen F4, 16GB 1600MHz G.Skill @1.25V, EVGA 550-G2, Silverstone PS07B
HTPC: A8-5600K, MSI FM2-A75IA-E53, 4TB Seagate SSHD, 8GB 1866MHz G.Skill, Crosley D-25 Case Mod