I am looking to get my A8 6600K to 5Ghz, its at 4.9ghz right now. Don't worry about the psu, or airflow, or motherboard, those are good and not something that need to be worried, its thermal margin is about 10C under full load at 1.49v although it never gets that hot during gaming which is the most cpu intense task I do currently, I am wondering what would improvement I would see on my HSF if I replaced the stock fans on it with a single Delta AFB1212GHE running at full RPM. My HSF is a Phantek TCDX12.