Most of them are 95mm fans. You can get replacement fans on ebay for almost any relatively common GPU because most of these fans come from the same places and

Most of them are 95mm fans. You can get replacement fans on ebay for almost any relatively common GPU because most of these fans come from the same places and the companies that make the fans for the GPU manufacturers long ago figured out there was a market for replacement units. The higher end card companies in some cases will just ship you a replacement fan if your email to them is pleasant. Or sell it to you for a modest price. I just looked and I can get replacement fans for my specific GPU for less than $20 including shipping.