I am not using my PC for gaming, still I replaced the tiny fan on my ASUS EN6800 nVidia Graphic card with the big Zalman VF900-Cu. Why? Because now my PC makes much less noise.

The standard VGA card fans tend to make a high pitch noise that add quit a bit to the overall noise level of a PC. Clearly there was no need from a cooling standpoint to replace the VGA card fan. It does make a lot of sense though to invest in a new fan to make your PC more silent.
The Zalman VF900-Cu is a great choice because it is very silent, mostly because of its two big heat pipes.
The installation is very easy. The package also includes little heat sinks for the VGA RAM chips. With the included Fan MATE 2 you can adjust the fan speed even from outside your PC case if you need that (only useful for gamers).
Find deals for the Zalman VF900-Cu.