That said on really really cold water mine 4770k has done 5250 mhz.
I wasn't going for anything quite that intense, as far a speed is concerned...but I really "REALLY" wanted at least 4.5 out of it...
...better luck next time I suppose.
Although still, if anybody has suggestions for settings adjustments to try out, I'm all ears.
NOTE: As for cooling, my case doesn't help a great deal in that regard. I build inside a Prodigy M (White) - so airflow is weird to begin with which is why I went with liquid. From what I can tell, it does a great job given its orientation inside the machine and the odd airflow system of the machine. Intake is from the top, RAD is hooked to the rear exhaust set to pull. Exhaust is though the bottom. Ambient room temp is typically never higher than about 23C - idle of the machine is fine at 26-31C. obviously, gaming/other activities rarely push the CPU temp past 65C