What should temps be with a i7 6700k and noctua NH-D15?

Lars01 · Feb 5, 2016

Hey, i have built a new skylake gaming pc but the cpu temps are too high.

With prime95 small fft i am getting a max of 78 degrees on the package. It is usually around 75-77 degrees. On the cores, i got around 70-76 degrees.

With aida64 with only cpu test, i got stable 45 degrees on the package. and a little bit lower on the cores.

When testing cpu and fpu at the same time on aida64, i am getting max 68/69 degrees on the package. average around 64-67 degrees. On the cores i am getting max 67/68 degrees and around 58-67 degrees average.

The noctua NH-D15 is one of the best air cpu coolers out there, and the i7 6700k is stock. What can cause the high temps. Shouldn't it be max 60 degrees or something?

I need some experts that can help me with this, but i can not try to solve the problem before monday, because i am on a trip. But yeah, need advice

chrisITguy · Feb 5, 2016

There are many variables in cpu temperature including cpu paste(application method, type, brand etc), ambient temperature(room temp), case cooling and the list continues. There is an Intel Temperature guide at the top of the CPU forum located here http://www.tomshardware.com/forum/id-1800828/intel-temperature-guide.html that provides great information.

Max for 6xxxk is 100. Your temps are more than fine.

jhall18 · Feb 5, 2016

Those temps are good, but are you sure you've screwed it in properly? Did you screw in a diagonal pattern? How much thermal paste did you apply?

synphul · Feb 5, 2016

70-76c is considered pretty warm, typical for heavy loads like p95 v26.6. Even though max is 100c, that doesn't mean it's 'good' or 'ok', it means your cpu is hitting the thermal wall running so hot it has to throttle at that temp. A good cooler doesn't necessarily keep your cpu under 50c all the time, a good cooler will keep handling the heat as it increases.

For instance you might find another cooler than handles that cpu and keeps it at 70-76c under stock load. However when overclocked and running hotter, the nh-d15 may still keep it around 76c while the lesser cooler cannot.

Other considerations, what is your ambient room temp where the pc is running? That will have a direct effect on cooling regardless of which cooler is used. Has your motherboard enabled any sort of auto overclock or 'performance' modes? What is the current vcore your cpu is running at? The cpu may run at stock speeds on varied vcores, the higher the core voltage the higher the temps.

Lars01 · Feb 5, 2016

Well, to clear up some things, here is my specs:

-Fractal design r5 black (two stock fractal design case fans, one in the front and one in the back. I also have added a Noctua nf-a14 fan in the front. So, two fans it the front and one in the back.)
-i7 6700k
-Noctua nh-d15
-asus z170a
-hyperx savage 2x8 gb 2666mhz cl13 ( i have not set them to 2666mhz yet. They are currently at 2133 mhz)
-Corsair rm850i
-Msi gtx 970 4gb gaming
-Samsung 850 evo 250gb
-WD caviar blue 1tb

The ambient room temp is around 23 degrees. The idle temps are pretty good though. It idle's at 23-25 degrees.

I was hoping for no problems with this build, since i think the airflow is quite good, the cooler is a beast. But no, it runs hot:/

On cs:go it runs around 30-40 degrees btw, but i dont think it does take much cpu power, so i dont know how hot it runs in games yet.

I do understand your'e piont though. But i was hoping that it would be around 60 degrees in prime95 though, when it is over 70, i get a little bit worried.
I have heard that prime95 stress the newest intel cpu's too much, is that true? I have sheard that aida64 is better. On aida64 i got under 70 degrees all the time though, and that is good? And by the way. I used HWmonitor to monitor the temps on prime95. Maybe HWmonitor is wrong? You see, when i did prime95, i opened AIsuite and there it said that the cpu was 65 degrees, but HWmonitor said 70-80 degrees.

Well, the bios on the motherboard are the newest version. Should i try to change it to an older version to see if there is the problem? I rode on another forum that there was a guy who got very hot temps, but then he tried updating the bios to a newer version, and he got a 20 degree cooler cpu after that. He thought it was because the older bios version made the volt run higher than it needed so that it runned to hot. Maybe that is the case with me, but with me it would be vice versa. I don't know. I may try to check just in case that is the problem.

I am also going to re apply the thermal paste to check if i applied it wrong or something.

About the vcore and stuff, i don't know what it runs at. If you mean what mhz the cpu runs at, it is 4,2 GHz when stress testing. I think it is some turbo thing on the cpu, because i have not overclocked it from 4 to 4,2 GHz. and also, i can't check / do things with the pc before sunday, because i am on the mountain skiing until then.

Btw, should i maybe buy an extra rear fan at the top, so that i get more heat out quicker? On 100% load, should the cpu cooler run at 100%?

Well, thanks for replying. I hope that you also can help me when i come home

I want lower temps

Lars01 · Feb 5, 2016

jhall18 :

Yeah, i screwed it in all the way

jhall18 · Feb 5, 2016

Lars01 :

Hmm, try ramping up the rpm and see if that makes a difference.

synphul · Feb 5, 2016

The bios controls the fan speed for the cpu cooler and likely has settings you can change in the bios. It won't start blowing harder until it reaches whatever temps the bios tells it to. I think hoping for 60c on p95 is a bit ambitious even for water cooling. The 26.6 version of p95 is more appropriate for haswell and newer cpu's, the latest version of p95 can generate more stress than necessary.

When it comes to stress tests, they're all different which is why one may produce higher temps than another. Which test you use is up to you, each have their own preferences. P95 is usually pretty good for thermals using small fft's because it creates a heavier than typical load (meaning worst case scenario than you're likely to see in real day to day programs) and it's a steady load that doesn't fluctuate all the time. Another good test is asus rog realbench since it runs through a variety of more real world applications and is also pretty demanding on a number of systems from storage to memory to cpu and gpu.

Vcore is the core voltage, how much voltage is applied to the cpu cores. It should be listed in the bios. If the current vcore is say 1.35v and your cpu still runs stably at 1.29v, setting it lower will reduce overall heat output. Provided the vcore isn't set too low which will result in crashes and bsod's.

Those temps you're getting in prime95 you may not reach in many or any of the actual programs you use. Video rendering may, outside of that you'll probably be seeing more realistic temps in the 60's even under load.

Tradesman1 · Feb 5, 2016

Prime has a problem with many Skylake CPUs

http://www.tomshardware.com/news/skylake-prime-number-bug,30979.html

Also it's going to run much hotter than you will ever generally see during the use of your rig.

Lars01 · Feb 6, 2016

There was a guy in another thread that said to me the vcore voltage is why my cpu is running that hot. I am going to set it down, he said that i should set it down to 1.25 volt, and i can also try it even lower with small steps.

But why do i have such a hot cpu? When i see others with i7 6700k and a noctua nh-d-15 they get like 50-60 degrees. And many people get under my temperatures and they have not set the voltage down.

Maybe i have a lazy chip, and maybe i have lost the silicon lottery. I actually want to rma the cpu.

Lars01 · Feb 6, 2016

Ok, so i am home now, downloaded "Prime95 version 26.6". I runned small fft's in 10 minutes. I got max 63 degrees on one of the cores. Here is what i got at max-

core0 - 63 degrees
core1 - 61 degrees
core2 - 59 degrees
core3 - 57 degrees

package - 63 degrees

Max volt - 1317 volt (look like i am going to turn it down).

Looks like the thermal paste does not cover the whole cpu since two of the cores have a higher temperature than the last two?

I used HWinfo and HWmonitor to monitor the temps.

Tradesman1 · Feb 6, 2016

Temps per core are going to vary, often 0-1 are lead cores and run the most - thus higher temps

Lars01 · Feb 6, 2016

Ok thank's. Ok so, can you help me with lowering voltage on cpu? How much should i set it down, and where is it? Can lowering the voltage void the warranty of the cpu?

Tradesman1 · Feb 6, 2016

Go into the advanced page of the BIOS, and find CPU voltage then drop it maybe - 0.03 at a time, after each drop, boot to Win and check for stability and can check temps also

Lars01 · Feb 6, 2016

Is it going to void the garranty?

Tradesman1 · Feb 6, 2016

Lars01 · Feb 6, 2016

Ok, but i checked bios now and it say's that the CPU core/Cashe Voltage is 1.264V on my Asus z170-a motherboard. Is that too much?

Tradesman1 · Feb 6, 2016

That's OK, how are temps? Might be evenable to take it lower, it's all in ttesting what it takes

Lars01 · Feb 6, 2016

Ok, so i checked the thermal paste and i took some less on this time. Now i am getting 68 degrees on aida64 instead of 63 that i got last time. Can it be because i took the thermal paste on just a little while ago?

Tradesman1 · Feb 6, 2016

It will take a short time to set up, depended on what kind you usedbest to to OC immediately

Lars01 · Feb 6, 2016

I do not understand that much of what you mean. I was testing aida64 and got 70 degrees, as i got before applying new thermal paste. I thought i got 63 degrees in aida64 before applying new thermal paste, but that was with prime95. I am testing prime95 now, and i have so far gotten max 64 degrees, one degree higher then before applying new thermal paste. But the room is warmer than it was a couple of hours ago so.. I guess i am not seeing any temperature improvement, it looks like the same as before. I am going to try lowering the voltage a bit tomorrow.

And by the way, i am seeing spikes to 44 degrees just in idle sometimes, can it be because the thermal paste is new?

Lars01 · Feb 8, 2016

I have played battlefield 4 for 1 and a half hour now, and the max temp was 58 degrees on the cores. It is good or bad?

cordes85 · Dec 14, 2016

are all thermal pastes's born equal? I use Arctic MX4 and never go about 58 degrees running prime 95 and unique valley at the same time, My ram is 2x16b G SKILL trident Z 3200 cas 14. i could go water cooling but Noctua's D15 is the best IMHO air cooled cooler. I do different fan curves, on my ROG motherboard software to allow more air into the case. Do you have positive air pressure? Do you have adequate fans? Sorry no answers just more questions.

Skipyyy · Jan 12, 2017

Lars01 :

There was a guy in another thread that said to me the vcore voltage is why my cpu is running that hot. I am going to set it down, he said that i should set it down to 1.25 volt, and i can also try it even lower with small steps.

But why do i have such a hot cpu? When i see others with i7 6700k and a noctua nh-d-15 they get like 50-60 degrees. And many people get under my temperatures and they have not set the voltage down.

Maybe i have a lazy chip, and maybe i have lost the silicon lottery. I actually want to rma the cpu.

What should temps be with a i7 6700k and noctua NH-D15?

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