I have my CPU at 4.7, its just using a single fan on the Corsair H80i GT sealed loop Radiator system and a couple of small standard case fans and thats it.
I dont believe in stressing the heck out of my CPU with multiple types of stress testing programs as the more you do that I imagine it doesnt do your CPU any good as in reality you will never hit those very very extremely high stress test voltages and tempreatures etc.
If your just a normal everyday user that maybe likes to game then just stress out the CPU and the System a few times using Asus Realbench lastest edition which I think is version 2.42, to me anyway thats more than enough stressing and testing in several ways.
A lot of people even just use very highly CPU, Ram and Graphic intensive games to check things, those are also a good bet too as some of those games can push your system quite a lot but not enough to fry your CPU or damage anything, most they would do is crash the system really, just my opinion though, people seem to be paranoid about practically needless stressing the CPU/Memory/Graphics to near death, there is no need in real life if you think about it UNLESS your going to be doing some major intensive things everyday 24/7 and I dont know anyone at all that does that, just my opinion though and your choice.
Anyway, a lot of people talk of setting LLC to level 4, 5 or 6, well I can say I tried that at 4.7 and 4.8 and it sent my voltages skywards towards 1.5v and I had to instantly stop tests before anything broke.
I tried all LLC levels and for me I found LLC level 2 was best, you need to have some Vdroop but not too much or too little either and the auto setting kinda sucks.
My voltages I have for 4.7 are a "+ offset" setting, I dont like adaptive setting as the cpu doesnt like it for some reason, and the offset setting means that my volts and temps drop away down very low like 0.8v on idle and about 1.3 to 1.425 under max stress which is acceptable going by Intel's book as far as I am aware.
The Tempreature in my room here is always about 25c or possibly a few degrees warmer and the cpu core temps sit around 23 to 26 on idle and under stress no more than maybe about roughly mid 70's at the very most give or take a few degrees depending on circumstances.
Anyways, just my 2p's worth guys.