I have a build with crossfire 6870s but one has some bad fan noise. I doubt there is any warranty since it was purhcased used on ebay so I am looking at some options to replace it. Does anyone make replacment fans for these? It's the Direct Contact model that is black and red. The fan is clear. I had to just zip tie a fan on there and would really like to keep it looking as orignal as possible.. thx for any input.