I bought this CPU brand new a few years ago and was lucky to achieve a 4.4Ghz overclock at just over 1.2v on it with an air cooler I got from AliExpress. At 1.2v the chip ran extremely cool at low 30's, I could have tried to push it a bit higher but I really wanted to keep the voltage low and not degrade it The only reason I am selling the CPU now is because I've upgraded to the latest 5700x3D (and can barely tell a difference under normal use). Reluctant sale, will just keep it if I don't get asking price. Let me know if you have any questions.
eBay