i5 6600K - CM Hyper 212 EVO - High Prime95 temperature?

Padster1 · Apr 4, 2016

Hi so I got an i5 6600K a couple of months ago along with an ASUS Z170i motherboard (mini ITX) and a Phanteks Evolv ITX. I wanted ITX because i was sick of having such a big tower, coming from a Zalman Z11 but I have an MSI GTX 970 (100ME just for bragging rights) which is massive and didnt want to get rid of it so I needed the bigger case anyway. But, I've decided that I want to start overclocking it so I started out with a Prime95 (mixed) test for a baseline max temperature and I found that in the first test it carries out it hovers around the 65-65C degree range but in the second test it carries out it bumps all the way up to 85C BUT then it goes down to 65C again on the third test. My idle temps are around 22-25C.
Is this normal of Prime95 or is it related to my CPU? I have plenty of airflow - 200mm + 120mm intake and 140mm exhaust and I even removed the dirve cage and SSD cover-thingy it has to improve airflow which did actually lower my temps by about 3C.

Ryan_78 · Apr 4, 2016

How much did you overclock? The hyper 212 EVO isn't that strong but it will work.
Also make sure thermal compound is applied correctly and cooler is seated properly.

Padster1 · Apr 4, 2016

Ryan_78 :

I haven't overclocked at all. I was going to but I tested to see what my temps were without an overclock just to see if it would be safe to do so. And both the thermal paste and the cooler are on correctly.

Dark Lord of Tech · Apr 4, 2016

Are you using Prime 26.6?

Quixit · Apr 4, 2016

Prime95 uses the new vector instructions included on newer Intel CPUs so it can get your CPU hotter than nearly anything else. Some people suggest running over versions that don't support these instructions for load testing, but really it's up to you.

Ryan_78 · Apr 4, 2016

Try running Intel burn test or IBT

Padster1 · Apr 4, 2016

Using Prime 28.7.

Padster1 · Apr 4, 2016

Quixit :

So how come its only one of the tests that raises the temps up to 85C?

madmatt30 · Apr 4, 2016

Then if you must use prime drop back to 26.6 or as suggested use Intel burn test or aida 64.

geofelt · Apr 4, 2016

If a cooler is mounted well, I expect idle temperatures to be in the 10-15c. range over ambient.
Unless your room is very cold, I suspect your measuring app is not correct.
You might try HWmonitor and see if it differs.

Prime95 is not a good test. The instructions uses are not what we typically do.
Try using OCCT. It will stop the test at 85c.
Monitor vcore. CPU-Z is good. Vcore should not exceed 1.4v.
Check to see what the multiplier range is. At stock, it should be 35-39.
One possibility is that you have inadvertently overclocked by asking the bios to reset to "optimal" settings.

Padster1 · Apr 4, 2016

So I just used LinX to stress test. I 3823MB of ram and I ran it for 10mins. The max temp was 90C - which makes me way too uncomfortable. Any thoughts?

Padster1 · Apr 4, 2016

geofelt :

I always use HWmonitor and again it was displaying 20-25 idle.
I monitored the VCore whilst using LinX and it didnt go over 1.392v.
I went into the BIOS and checked the preset overclocking options and everything was set to default, plus the multiplier was on 35x for idle and 39x for load.
LinX pushed it to 92C this time - very confused at the moment.

geofelt · Apr 4, 2016

The temperature at which the cpu will throttle to protect itself is around 100c.
I am not familiar with LinX as a tester. Intel burn test is designed to "burn", namely it uses instructions to generate maximum heat.

See if there is a bios update for your motherboard that might address the issue.

It is the 1.392 vcore that is generating the heat.
Consider the possibility that you were unlucky and got a "dog" chip.

Here are some statistics from silicon lottery, an outfit that bins chips and sells the better ones for a price premium.

As of 2/16/16
What percent can get an overclock at a somewhat sane 1.40v Vcore.
I5-6600K
4.9 11%
4.8 38%
4.7 70%
4.6 83%

gokitty199 · Apr 4, 2016

use a older version of prime 95(as stated above), when i went from the new version with whatever they added for intel cpu's down to 26.6 it was about a 18-20C difference with a h100i, it got the cpu as hot as can be, going above 80C nearing 90, then when i dropped down to 26.6 the cpu stayed around 68-70C

Padster1 · Apr 4, 2016

geofelt :

Thank you so much for your help so far by the way, really appreciate having peace of mind.
[strike]So do you think I would be able to set vcore to 1.4 and overclock? Or do you think that considering my chip isnt great that it would be wise to leave it as it is. I'm not really desperate for more performance as of yet but perhaps when BF5 is released then I may need to.[/strike]

Padster1 · Apr 4, 2016

geofelt :

UPDATE: JUST UPDATED MY BIOS - ISSUE SOLVED?
I updated it from 0803 to 0806 and now LinX recorded a max temperature of 73C with a max core of 1.28v and Prime95 now showed a max temp pf 65-68C with a max core of 1.26v apparently. So now that I've been getting these temps do you think I'll be able to overclock safely and well? I'll stress test again for another few hours to make sure but so far so good.

geofelt · Apr 4, 2016

Padster1 :

Good job! I do think you resolved the problem.
To simply OC,
Gradually raise the multiplier and monitor your results for temperature and vcore.
Leave all other settings at default or auto. That includes ram.
When you reach 85c. or vcore around 1.40 stop and perhaps back off a notch.
Then implement speedstep and adaptive voltage.
That will allow your cpu to lower the multiplier when it has little to do.
The vcore will also be lowered so there is little stress unless you need it.

i5 6600K - CM Hyper 212 EVO - High Prime95 temperature?

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