i7 6700k OC + Temps

Nichrome · 25 Sep 2016 at 14:01

Hi OCUK Community!
Long time no see

I've recently upgraded to Skylake system, here's the spec:
i7 6700K
Avexir White 2x8GB DDR4 2400MHz (@2133MHz)
MSI Z170A XPower Gaming Titanium (BIOS V1.2)
MSI GTX750Ti (at the moment, will upgrade next month)
Custom H2O loop for CPU (240mm rad, push-pull) [Distilled water as coolant]
Some HDDs
8 fans (5x Corsair, 3xAerocool Orange Shark)
Corsair 540 Air.

Now:
I managed to OC my CPU to 4.6GHz with 1.175V (mobo allows auto-increase of 0.05V so it sometimes go up to 1.225V).
Temps are as follows:
IntelBurnTest 70C~ (30 Passes of custom [12GB])
OCCT 55C (1h, 90%)
Gaming 30-40C
Idle 23C.

I am having a feeling that temps for Intel Burn Test are a little bit too high, especially for this voltage? Thermal Paste used is Arctic MX4 (using this since I build PCs [Q4 2013]).
I am aware of the fact, that IBT is EXTREME, and that there is no game that would push my CPU to that much stress..

My CPU managed to easily overclock to 4.8GHz (had 4.9GHz running Cinebench and scoring 1063 points), however 5GHz required 1.45V (I've set 1.35V but thanks to the BIOS, it automatically pulled 0.1V more).
I have set override mode, although if needed, it pulls up to 0.1V more than set, which is annoying me much.

What do you guys think: is 1.175V any good for 4.6GHz OC? From image you can see it uses more voltage than set in BIOS.
I am not looking to OC my memory, we all know it gains no performance in gamer's life.

Smffy · 26 Sep 2016 at 12:28

Seems like you got yourself a good chip there mate...

Thats quite a low voltage for the OC, from what i've seen past 4.5-4.6 the voltage step is quite something to stabilise it. Of course the diminishing returns of the addition 0.1 on the OC might not even been worth the temp gain and wear on the chip.

Nichrome · 26 Sep 2016 at 13:19

I think I could live with 4.8GHz as then it uses something slightly above stock voltages(1.275). But what is a bit annoying, is how core temps vary. Hottest core was 70C but coolest one during IBT was 58C! So as soon as I went for 1.35V (1.45 when BIOS adjusted itself for 5GHz) temp on hottest core was 88C and 79C on coolest one.. And it was stable as well

chilipeppersc · 26 Sep 2016 at 18:41

That is an awesome chip. I'm looking to push mine soon

Nichrome · 27 Sep 2016 at 14:42

I am just wondering, if there is any way to force my BIOS to stay on the voltages I set, instead of allowing some increment? That bothers me much..

varkanoid · 3 Oct 2016 at 15:31

Are you using offset V or vcore to set the voltage ? I believe if you do it the vcore way the voltage stays set.

Nichrome · 3 Oct 2016 at 21:39

I use VCore to set voltage. And I set the mode to "override mode" instead of offset, adaptive or similar in the menu available.

mowlio · 4 Oct 2016 at 18:42

Sort of off topic, but is there a list of which settings to use for over clocking 6600k/6700k I've been looking but all I can't find a definitive answer. All I read is change bclk/multi and volts, disable onboard graphics. Is it really that straight forward?

Nichrome · 4 Oct 2016 at 19:57

mowlio said:
Sort of off topic, but is there a list of which settings to use for over clocking 6600k/6700k I've been looking but all I can't find a definitive answer. All I read is change bclk/multi and volts, disable onboard graphics. Is it really that straight forward?

Hmm yeah, pretty much. And there is no list that can be used, as each CPU and motherboard is different, so settings will also be different.