Core i7 6700k skylake air cooled temps? Are mine too high?

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bradforj287

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Mar 15, 2016
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I recently built a system with the new Core i7 6700k 4.0 ghz intel chip. I am using the cooler master 212 EVO as my heatsink + cpu fan. My case is the Fractal Design Define R5. I'm running 2 140mm case fans in a push/pull configuration with the cpu heatsink fan pushing air through the heatsink and out the back of the case. 3 fans in total (not including gpu or psu fans)

My windows idle temps are around 25c. They fluctuate rapidly between 21-22 to 28-29.

I'm playing a less demanding game right now (divinity original sin) on ultra settings and my CPU barely has to work hard for this game. With temps in the 30s to low 40s. My graphics card seems to be doing most of the heavy lifting.

Temps recorded during Prime95 were a different story though. I ran 2 tests with prime 95:

1) The default test prime95 offers when you open the app (i think it is blend) I ran that and the CPU immediately went up to the 50c range and then slowly climbed up to high 60s/low 70s.
2) If i change the test to the maximum heat one, the CPU immediately shoots up to low 70s and stays there.


How are my temps for this CPU and cooler? Are the 70+ prime95 tests anything to worry about?

 
Solution
synphul
Idle temps are when the processor is not under load, not when it's at 10-20% load. Preferably 0% (can be hard to achieve with background tasks) and let it sit for 5-10min to get a true 'idle' temp. Fluctuating temps mean the load and cpu work is also fluctuating. Think of running vs walking. Walking is slower than running but it's not standing still either and that's what idle means. Standing still.

The temps seem fine given the cooler and the load on the cpu. Low-mid 70's would be about normal for that cpu under heavy stress. For checking thermals on intel's newer cpu's, prime95 v26.6 (not the latest version) is recommended. Use small fft's test to get a steady state load, otherwise the test jumps around too much and you're not...
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Suribachi

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Dec 8, 2014
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Those temps given that cooler and CPU seem nominal. During idle, windows is doing a bunch of background tasks which contributes to the fluctuation. Prime95 is a worst case scenario, especially max heat as that test is not reflective of daily use. For CPUs you really only getting too hot if you get to the 80s or higher.
 
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Stysner

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Apr 9, 2015
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With a 212Evo that's pretty decent. Fluctuations in temps are very normal, and not important (when idling/not at full blast). Low 70s isn't dangerous, especially when in a stress tester. While gaming or even rendering (at 100% utilization) you'll probably stay 5C under that Prime temp. So you're fine. You can overclock a little, too, you're not in the danger zone by a long shot.

You might want to undervolt it though, my mobo (MSI Z170-A G45) even with updated BIOS ran my 6700K @ 1.260V (stock). I've overclocked it to 4.6GHz @ 1.230V. The stock voltage is 1.200V. So you could gain some degrees by setting the voltage manually to 1.2V.
 
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angelo143

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May 28, 2016
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I have about same system with an i7 6700k ,but I have a costume water loop with a dual 120m radiator ,I have 2 140m fan at the front an one 120m fan back . My temps are from 25c to 27cand at max load I get 65-70c and I'm running windows 7 64 bit .in first place I had the same issue with you the temps was 25 and then climbing to 30 and some time even 40 in idle and at max load to 85c .so I recommend u reseating your heat sink and re apply thermal paste (only a small amount on the CPU ) and don't tite all the way down the heat sink just make sure it stays in place and hopefully your temps will stay stable .Also make sure to download all the drivers for your CPU and chipset because it will make the CPU stable to 4.0ghz and not playing around.i also recommend you running the cinebench r15 and check your temps from the real temps its should be around 65- 75 degrees. If that didn't help go to the bios and try lowering the voltage little by little and running the cinebench to make sure you wont have any problems. I hope this was helpful.
 
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synphul

synphul

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Mar 11, 2011
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Idle temps are when the processor is not under load, not when it's at 10-20% load. Preferably 0% (can be hard to achieve with background tasks) and let it sit for 5-10min to get a true 'idle' temp. Fluctuating temps mean the load and cpu work is also fluctuating. Think of running vs walking. Walking is slower than running but it's not standing still either and that's what idle means. Standing still.

The temps seem fine given the cooler and the load on the cpu. Low-mid 70's would be about normal for that cpu under heavy stress. For checking thermals on intel's newer cpu's, prime95 v26.6 (not the latest version) is recommended. Use small fft's test to get a steady state load, otherwise the test jumps around too much and you're not getting steady accurate results.

http://www.tomshardware.com/forum/id-1800828/intel-temperature-guide.html
 
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