I7 6700k running a little warm. Solutions?

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ChuckGuite

Commendable
Jan 8, 2017
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Good day,

I have just completed my first build.

I7 6700k
Asus z170a
16 g G.skill DDR4 3000
EVGA Geforce gtx 1080 sc
Coolmaster Hyper 212 evo

I tried my hand at some overclocking today and ran into some temperature issues.
Initially I had my Vcore at 1.35v with a bclk of 100 and 45 multiplier, which brought up my core to 4.5 ghz. I ran it through RealBench and had a stable system but my core temperatures were dis- concerning. On average I was below 80c but my maxes reached 90c.

I did some research, which included reading the Intel Temperature Guide, and dropped my multiplier to 44 and Vcore to 1.325v in hopes of lowering those temperatures. I ran that through the Prime95 v26.6 Small FFT for about 15mins and my temps. hovered just above 80c, maxing out at 84c. Currently, idle temps are between 25-31, 32c.

My next step is to readjust the heatsink, which I will do tomorrow. I was wondering if anyone could shed some incite on this matter? I've read about similar builds with air cooling that run cooler with a higher overclock and am open to suggestions.

Thank you for your time,

Chuck
 
Solution
synphul
I would agree, 1.35v seems a bit excessive for such a mild overclock. It's only a couple hundred mhz over stock turbo. Core voltage creates heat, once an overclock is stable (ie not crashing during stress tests) the next move is to slowly decrease the core voltage until the overclock no longer remains stable. That way the core voltage can be adjusted down to a point where it's just enough to maintain stability without being unnecessarily high. For instance you might find you can maintain 4.5ghz at 1.3v or 1.28v and the additional .05 to .07v is just adding to the heat.

The 212 evo is also a decent cooler for what it is, but it's a budget cooler. If $30 coolers were all that were ever needed then more expensive, complex and more capable...
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Rahul_Ignited

Rahul_Ignited

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Apr 17, 2016
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CPU overclocking can differ from system to system. A similar CPU in exact similar conditions with similar hardware can yield different results. That's why you hear so called 'Silicon Lottery' enthusiasts talking about.

In your case make sure you mount the cooler properly with a good TIM (Thermal Interface Material) and also make sure that your case is well ventilated and nothing is blocking the airflow around the CPU. If that doesn't fix the problem then maybe you need to put your hands on a beefier cooler.
 
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MeanMachine41

MeanMachine41

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May 8, 2014
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One tip is to use a good thermal paste (TIM) either MX4 or AS5 which have excellent thermal conductivity at 8.7 and 8.9 (W/mK) respectively and measured in watts per square metre of surface area.
Applying too much TIM can reduce the thermal conductivity so it should be applied sparingly to fill just the tiniest of voids. It really does make a difference and maybe why others with the same system get better results.
 
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n0ns3ns3

n0ns3ns3

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May 25, 2016
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212 eve is not meant for that. i7 at 4.5GHz @ over 1.3v consumes well over 100watt under prime95. can get into 150watt (depends on the exact clock, voltage and chip).
IMHO, you should try to get the overclock with much lower voltages. 1.2v should be enough for 4.5GHz.
I wouldn't recommend going beyond 1.25v without high end air cooler or decent liquid cooler.
 
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ChuckGuite

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Jan 8, 2017
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Thank you for your reply. I have thought of lowering the voltage but wasn't sure if it was the right move. I'll try to do so in the morning along with the other suggestions.
 
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synphul

synphul

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Mar 11, 2011
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I would agree, 1.35v seems a bit excessive for such a mild overclock. It's only a couple hundred mhz over stock turbo. Core voltage creates heat, once an overclock is stable (ie not crashing during stress tests) the next move is to slowly decrease the core voltage until the overclock no longer remains stable. That way the core voltage can be adjusted down to a point where it's just enough to maintain stability without being unnecessarily high. For instance you might find you can maintain 4.5ghz at 1.3v or 1.28v and the additional .05 to .07v is just adding to the heat.

The 212 evo is also a decent cooler for what it is, but it's a budget cooler. If $30 coolers were all that were ever needed then more expensive, complex and more capable coolers wouldn't exist. Another thing you might check with the 212 evo that often gets missed is the thumb screw in the center. You don't want to go overboard since skylake cpu's are a little more susceptible to excessive mounting pressure but that thumb screw is designed to increase the pressure for better contact between the cooler base and ihs on the cpu. It's not always a matter of just tightening down the 4 mounting screws. When I mounted mine it was really loose at first until snugging that center screw up a bit.

I wouldn't stress over thermal paste, there's only a 1-3c difference among over 40 common brands. There's no 10c magic to be found there by using mx4 or as5 over coolermaster's included tim and while both of those are fine they're not the top paste either. Many tests have been done on thermal compounds and the idea that something with 'silver' in it or anything else is going to make a night and day difference isn't true.
 
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Solution
MeanMachine41

MeanMachine41

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May 8, 2014
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TIM is not a thing to stress over, however as in OILS ain't OILS. TIM ain't TIM and there's considerable differences. When you have done the amount of OCing I have done and tried various compounds. It does make a difference. Some have low thermal conductivity and don't last very long before having to be re-applied. Most decent thermal compounds do contain metal oxides and liquid metal products clearly have the highest performance on the market. You can get TIM with as little as 1.2 (W/mK) and not not worth using or as high as 20 (W/mK) which is grossly expensive given the quantity supplied.

There are many compounds available and I personally have used both AS5 and MX4 both with the right viscosity and easy to apply. It can be the difference of 10C between good and bad and in OCing every little bit counts. LN2 is another ballgame where even higher (W/mK) is desirable.

7iWOYHM.jpg


In general every product with a delta temperature of up to 10 Kelvin is totally fine to use performance wise. Everything with a higher delta is usually not worth the price because you should find cheaper products with a better performance. You will notice that Coolermaster IC Essential E2 has a higher than 10 kelvin range.
 
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synphul

synphul

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Mar 11, 2011
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Coolermaster has several different thermal compounds, only 3 of which are listed on that chart. They also have IC essential e1 which is within the same range as the others as well as their ic value v1. Unfortunately I've yet to find anything that confirms what ships with the 212 evo, it's not mentioned on coolermaster's website and I just checked the instructions and paperwork as well as the tube that came with mine. It just says 'thermal compound kit' on the small tube.

1-2c difference isn't going to make or break an overclock. If it's reaching 70c on p95 someone isn't going to say oh that's good, but 72c, my overclock is no good. On the other hand if it's reaching 94c, suddenly running 92c isn't going to make it all better. It is what it is. Ln2 has nothing to do with this situation, it's entirely different. Since the included paste is free, it's hard to find something else for a cheaper price.
 
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ChuckGuite

Commendable
Jan 8, 2017
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I will make sure to tighten the middle screw when I readjust the cooler toady.
 
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ChuckGuite

Commendable
Jan 8, 2017
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So I dropped the Vcore to 1.2 initially and had stability issues of the hop. I readjusted to 1.25v and left the clock speed at 4.4 ghz. I ran it through Prime95 Small FFT and my temps were significantly lower. They averaged 70C and maxed out at 72C. So thank you for all of the suggestions I will continue to optimize.
 
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