High temperatures on i7-6700k

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Luhketa

Luhketa

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Oct 26, 2016
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Hi, I recently bought a i7-6700k and I am using a H100i v2 to cool it. The problem is that my temperatures seem very high considering the CPU cooler I guess. I have my CPU overclocked to 4.6ghz @1.315 Vcore. Under heavy load such as stress tests the Vcore goes up to 1.360 and the temps go up to 87°C and during gaming up to 80°C. Is this normal? I`ve already taken off the cooler, cleaned the thermal compound and applied it again but it didn`t actually help. My case is a NZXT H440, I have 3 intake fans on the front, 1 exhaust fan on the rear and the 2 fans on the radiator are on the top of the case as exhaust fans. Thanks everyone.
 
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Faktion

Faktion

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Oct 24, 2015
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Is it a sudden jump to 80C or is it gradual over many hours?

Those closed loop coolers sometimes have problems with slow pumps not cycling the liquid fast enough and causing the liquid to heat up over long periods of time.

1.36v is basically pushing the safe limit for these last two generations of chips. What are your temps like at stock?
 
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Luhketa

Luhketa

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I didn`t run stress tests at stock though, I can try, and yes this jump to 80C is in a matter of seconds, actually 1 second, when running IntelBurnTest the Vcore is 1.344 between each run an then the temps go down to like 65C, then the run begins and the Vcore goes to 1.36 and the temperature goes up just as fast, I really mean 1 second is ay 65C and in the next one 85C.
 
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Faktion

Faktion

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I always make an effort to test at stock so I can find the lowest voltage my CPU will run at with stock speeds. Its a good baseline to know.

How did you begin your overclock? Did you just put your desired speed in and raise the voltage until you got it stable?
 
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Luhketa

Luhketa

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Oct 26, 2016
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I started with 4.8ghz and 1.325v, the PC kept crashing as it booted, then I tried 4.7ghz with the same Vcore, failed Aida64 test after 15 minutes, then I tried 4.6ghz and it was stable, then I started lowering the voltage in the same clock speed, I didn`t try many voltages but 1.285v was unstable too so I just left it at 1.315v. It is a XMP profile. I will run the test at stock speed to see the voltage and I tell you.
 
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Luhketa

Luhketa

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Oct 26, 2016
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Here is all the info you may need I think, everything at stock speeds.
CwLR3B9.png
 
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Faktion

Faktion

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XMP are the RAM overclocking profiles. Even those sometimes need to be done manually. Especially when you get to the higher end 3200mhz+ kits.

You also went about overclocking the opposite way you should have. You should start at stock and work your way up from there fine tuning voltage and clock speed as you go.

The only step that I sometimes skip is I will lock in stock voltage and then overclock to the turbo boost clock speed and start from there since it will be a safe starting point.

Starting from the other end of the spectrum you will waste a lot of time finding a stable overclock without noting any of the temps\speeds\voltages along the path to getting there.

What voltage does 4.4ghz take? 4.2? What is the lowest voltage you can run at stock speeds? They are all good things to know.


If you had come from stock speed -> 4.6Ghz you would have seen where the the voltage increase put your temps over the top of the acceptable range. :)
 
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Luhketa

Luhketa

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Oct 26, 2016
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So basically I am not able to get 4.6ghz out of this CPU with this cooler? Wow this is really strange, I`ve seen people get to 4.6ghz using a H100i with temperatures below 60C. I really thing that something is not right I just don`t know what, I should be able to get to at least 4.6ghz
 
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Luhketa

Luhketa

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Oct 26, 2016
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Hmm, ok, thanks for all the help man, i`ll do what you said and start from stock all the way up, I think I lost on the CPU lottery haha, when I`m able to get a good overclock I will post here.
 
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Faktion

Faktion

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Well 4.5ghz isn't losing the lottery by any means :)

You can pay a small fee and exchange the CPU with Intel for a new one but you may get a better one or you may get a worse one.

What are you trying to do that a 4.5ghz 6700k wont do?
 
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Luhketa

Luhketa

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Oct 26, 2016
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Really, how can I do that?
 
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