At stock clocks it bottlenecked my 7970 ghz by 15% (getting 75% gpu usage) But once i overclocked. The bottleneck vanished. im currently stable at 4.5ghz 1.34volts prime95 gets it too about 55c. but gaming only about 44c. this is on a coolermaster 212 evo
Case fans help a bit. but its mainly the cpu cooler you can overclock with the stock cooler but to be safe i wouldnt go past around 4.2-4.3 or you can pay $30 http://www.newegg.com/Product/Product.aspx?Item=N82E16835103065
and have a nice cooler that will overclock fine like me. Honetly for $135 bucks the cpu is really nice. sure at stock clocks it bottlenecks my 7970ghz but considring thats the fastest gpu in the world. and the cpu is 140bucks and Unlocked. i personally wouldnt change my choice of getting the 6300. for the money its a damn fine cpu.
Also anthor reason i was getting bottlenecked is my cpu was not turboing to 4.1 it was going to about 3.7. so if it was acctually turboing correctly i wouldnt of been bottlenecked.
So yes jump on that cpu its great for the price