That cooler will do for a moderate OC on FX. You should increase the CPU voltage, but BEFORE you do that increase the multiplyer untel you can not get into windows. Then increase voltage to find stability.
Then test for atleast half an hour with prime95 while monitoring temps.
Continue this process until you feel temps are getting to high. Then drop a multiplier or two and viola, you have your OC with that cooler.
Then run Prime95 for 12 hours and if any errors occur, either increase voltages or drop multiplier again.
Test again for 12 hours.
You, sir are my hero. Simple steps for what seemed to me to be insurmountable complexity (thank the Lord for spellcheck).