is this cpu fan good for overclocking



 
1. I think you really meant a cpu cooler(aka fan). If your intent is to overclock the cpu, then yes, a better than stock cooler is necessary.
You also, for the fx series need a better than average motherboard.
Here is a link to help with that:
http://www.tomshardware.com/forum/id-2383150/motherboard-tier-list.html
The FX series have been around for a long time and have been bypassed by intel for gaming.
The FX cores are slow, and most games depend on the speed of a single master thread for performance. Most games can only effectively use 2-3 threads.
Here is an older link which might be of interest.
http://www.tomshardware.com/reviews/gaming-processor-frame-rate-performance,3427-9.html