Hello, in particular I do not like people who do not answer something specific. I use the same cpu at 3.8ghz, but this is not an exact science, so maybe the parameters I have are not the same for you.
I currently use a voltage of 1.253V and the load line of the CPU in Medium. I would recommend not exceed 1.325 - 1.35 maximum. Realize tests with Prime95 for two hours and Cinebech being stable.
I use a Hyper 212 led cooler master, I hope it helps you.