Help Overclocking i7 5820k (AIDA64 test)

Nope, 100 degrees is far too hot. Either the cooler isn't mounted properly, or you've hit your thermal limit.

What voltage are you running at?

92C is still too high really. It is a stress test, so approaching worst-case scenario, but that's still too high.

In terms of addressing it, do you understand what voltage does?

Obviously higher frequencies mean the processor is running faster = better performance. So you want your frequency as high as possible.
BUT, once the frequency gets too high, the transistors in the processor can't change state quickly enough and the system becomes unstable (tests fail, bluescreen/crashes/lockups, etc).
SO, if you want that frequency to be stable, you need to raise the voltage. Raising voltage effectively pulls the transistors to the correct state faster, making it possible to keep a stable system at higher frequencies.

The problem is that raising the voltage increases heat substantially. This is often misunderstood. Raising or lowering the frequency has a small impact on temperatures, but it's the voltage that has by far the bigger impact.

Your 5820K is a quite a power hungry (=hot) CPU, and you have a fairly entry level cooling solution. It's not surprising you're hitting thermal limits.

So back to your situation... you've already gone past the point Linus is talking about in his video. The CPU is too hot, which means the voltage is already too high.

Here's what I suggest, just do the procedure backwards...
What you need to do is lower the voltage and keep testing. Try ~1.22. Hopefully that will put your temps back into the safe zone. BUT, you need to see if your current frequency is still stable at the low voltage.
If NOT - you can either raise the voltage a little again (if you have some headroom on temperature, as in you're back under 80C), or you'll need to lower the frequency until it's stable.

The end goal you want is the highest possible frequency, with the lowest possible voltage (while still being stable), with temps under control.
And, just to reiterate, the two key levers you have to work with are:
Frequency gives you speed, but higher frequencies become unstable without higher voltages
Voltage increases stability, making it possible to hit higher frequencies, but at the cost of additional power and thus higher temperatures.

That's okay, but still kind of high-ish.

If you've tested thoroughly with AIDA64 and the system is still nice and stable with 4.25Ghz @ 1.23V, my question would be... can you get the voltage even lower and still maintain stability?
If you're prepared to put a bit more time in, keep dropping the voltage until you find the point where things get unstable. And then go a tick or two higher again. If you can get it down to or below 1.2V and everything's still stable, then your current cooling solution should be fine and you'll probably see temps under 75C most of the time.

Do i need a better cooler?

Click to expand...

Well, a better cooler will drop temps on your current OC, and also allow you to run higher voltages without the temps getting out of control. If 4.25Ghz is stable at 1.23V (you need to run a long stress-test to confirm this), then you have a good shot of hitting 4.5Ghz to 4.6Ghz at or a little over 1.3V. Better cooling could handle that voltage making that (probably) a usable 24/7 OC. But in the end you're getting around 5%-8% more performance. So maybe not worth it.

Hi Fraga500, I suggest you to test stability with prime95 for 24 hours to be sure at what voltage you are stable. If you are not OCing your memory I suggest you run In place FFTs in a custom blend test 8-4096K (15 min per FFT) it will took around 21 hs to complete all the FFTs. If you pass without errors after 21 hs you are 100% stable. Also have in mind that if you set priority to 10 your computer will be unusable for the time you run the test, first you should monitor the temps for 15 min running the torture test Small FFTs at priority 1 to check temps. If everything is OK with temps then you can run the 24 hs test.