I have a desktop with a Sapphire Radeon HD 4850 (512mb) video card, which is a few years old.
It works like a champ, but the shoddy fan that came with the card has started to sound like a lawnmower! I tried blowing dust out of the fan with some compressed air (even getting between the flutes of the heatsink), but no improvement. I took the heatsink/fan completely off and reseated it as well in case it was a rattle issue due to a loose screw, but again no dice.
How easy is it to replace this sort of thing? I don't want to buy a new card, since the existing card is still working fine. But I have had trouble finding an exact match for the stock heatsink/fan.
What do I need to know to choose a good third party solution?