My GPU is GAINWARD GeForce 9500 GT, it doesnt have a cooler, just heatsink. Temp is about 50C when idle, and 55-60C in games. So I though that it might be a good idea to see if I can add a cooler on this gpu beacuse I want to overclock it.
Idle temp seems high- that is usually indicative of restrictive chassis cooling.
Load temp of 60C is OK.
I'd probably look at getting a better rated chassis fan pushing more air into the case if at all possible. Using an active cooler to draw warm chassis air over the heatsink may not net you much improvement compared with better front-to-back chassis cooling (or side panel fan).