Is my CPU hot at idle

Petrolhead · 5 Jan 2017 at 15:51

Run an i7 5820K not clocked on a Gigabyte X99M motherboard. The cpu is water cooled using a Corsair H100gtx. The GPU is a 980ti which is also water cooled.

This is the flow of air in the case:

The CPU idle temp is about 49 deg C and the room temp is 23 deg C

Does this seem to be running a tad hot? I am sure it used to run at about 35 deg C in a smaller case with same cooling

I have recently reseated the CPU to see it that helped but no different.

The cooling pipes to the rad don't feel hot

pete910 · 5 Jan 2017 at 15:56

Don't have that particular CPU but I would say that is way hot for idle, I would check that the board isn't pumping to many volts to the CPU, I presume you've checked the cooler and what not

lude1962 · 5 Jan 2017 at 16:02

whats the fans on the rhs ?

varkanoid · 5 Jan 2017 at 16:04

Way too hot I have the one in my sig under NZXt X41 and it idles 24-29c!

Petrolhead · 5 Jan 2017 at 16:13

The fans on the RHS are for the GPU cooler rad 2 x 140mm, Noctua

I can feel the rump running in the cooler

varkanold, you cpu in running 24-29, whats you room temp?

I have just run heaven and the cpu climbs to 65 deg C which does not seem high

Legend · 5 Jan 2017 at 16:21

First thing I would suggest is to remove heatsink and reapply TIM. See what effect that has.

FredFlint · 5 Jan 2017 at 16:57

I would turn the fan's speed up. My 5930K idles is ~30C and I have the fans running slow. In summer, I increase the fan speed a bit and get the same temps. Full load temp is ~60C, that’s using handbrake so 100% load, temps will be less than 45C in a graphics benchmark. Also The DDR speed in high so you must be using the XMP profile, this is overclocking so might have upped the volts.

Petrolhead · 5 Jan 2017 at 17:37

I doubled chaecked the I could head the pump working with a stethoscope and its working.

I then turned the fans up to max. Its still sitting at 55 deg C

Five.Stars · 5 Jan 2017 at 17:52

According to your hardware monitor, the cpu isn't clocking down and running constantly at 3.7Ghz. This is why idle temps will be so high (I think). Make sure the Intel speedstep features are enabled in BIOS and also ensure you aren't running in High Performance mode in Windows.

Think it is usually referred to as EIST.

pete910 · 5 Jan 2017 at 18:21

Five.Stars said:
According to your hardware monitor, the cpu isn't clocking down and running constantly at 3.7Ghz. This is why idle temps will be so high (I think). Make sure the Intel speedstep features are enabled in BIOS and also ensure you aren't running in High Performance mode in Windows.

Think it is usually referred to as EIST.

My 4790k bounces all over 3.5 - 4 when idling, and mine sits between 29 - 31 normally, so not convinced that's the sole reason

Disco_P · 5 Jan 2017 at 18:37

Is it actually idling? With Corsair Crapware running it might be preventing your CPU from clocking down. Same with spreed fan (though not quite as bad)

lude1962 · 5 Jan 2017 at 20:40

cms239 said:
The fans on the RHS are for the GPU cooler rad 2 x 140mm, Noctua

I take it from the arrows , you're taking cold air from outside and heating it up via gpu rad, then this hot air goes through cpu rad, why ?

Petrolhead · 5 Jan 2017 at 20:44

Five.Stars said:
According to your hardware monitor, the cpu isn't clocking down and running constantly at 3.7Ghz. This is why idle temps will be so high (I think). Make sure the Intel speedstep features are enabled in BIOS and also ensure you aren't running in High Performance mode in Windows.

Think it is usually referred to as EIST.

I reseated the CPU, I think there was too much on preventing the heat going to the heat sink.

Had a play with the BIOS and Power options

Cheers for the help

Petrolhead · 5 Jan 2017 at 20:48

lude1962 said:
I take it from the arrows , you're taking cold air from outside and heating it up via gpu rad, then this hot air goes through cpu rad, why ?

No particular reason. What would you do?

ltron · 6 Jan 2017 at 00:27

Your CPU package was at 49C and this is usually significantly higher than the individual core temps, which are the important thing, and is nothing to worry about. In your first screenshot core #6 is at 39c which is fine given that you were running at full speed all the time.

koooowweeee · 6 Jan 2017 at 05:13

How are you applying the TIM?

FredFlint · 6 Jan 2017 at 18:19

Using XMP profiles for the RAM can lock the CPU frequency and turn off the turbo/speedstep thing, it depends on the ratio. It’s should still idle cooler than 49C though. Give RealTemp a try to get the temps.

Petrolhead · 7 Mar 2018 at 23:37

I thought I would resurect this thread.

Over the last year I knd of ended up ignoring this problem as I stopped playing games and it did not seem to be a problem.

Today I fitted a new GPU and while the PC was in bits thought I would have a spring clean. I decided to reseat the water block and see wht the temps were like.

50deg at idle! I then did a stress test and the cpu throttled back to 50% and the temp went up to 90deg!

At some point last year I water cooled my old GPU, a 980Ti and now I had the new 1080Ti so a spare AOI water cooler.

I decided to try this on the CPU and its now running at 22deg at idle and about 50deg stressed.

So it looks like my Corsair H100GTX is buggered

Just as well I had a spare now

mistersprinkles · 9 Mar 2018 at 03:26

lude1962 said:
I take it from the arrows , you're taking cold air from outside and heating it up via gpu rad, then this hot air goes through cpu rad, why ?

Although this is not ideal, an idle 980Ti isn't pumping out much heat, so I don't see this being an issue. Still it would be better to have a very high power fan blowing in via rear "exhaust" vent and have both rads pushing air out. That would create a lot of negative air pressure in the case (also not terrific) but it's the best solution here.

I would suggest to save current bios config, then restore all defaults in bios, turn fans and pump up to max and keep them there (again via bios) and replace TIM on CPU block with something high quality such as Kryonaut paste (watch a youtube vid on how to clean old paste if u do not know how). If this solves the issue you know you had a pump/fan speed issue.. or the TIM was bad... or it was a bad block mount onto the CPU.

Also check your temps with HWMonitor and CoreTemp just to make sure your current readings are correct.

Also high five for using all Noctua fans. Brown. The colour of droppings. The colour of quality. Those PPC fans mean business.

Petrolhead · 9 Mar 2018 at 08:25

mistersprinkles said:
Although this is not ideal, an idle 980Ti isn't pumping out much heat, so I don't see this being an issue. Still it would be better to have a very high power fan blowing in via rear "exhaust" vent and have both rads pushing air out. That would create a lot of negative air pressure in the case (also not terrific) but it's the best solution here.

I would suggest to save current bios config, then restore all defaults in bios, turn fans and pump up to max and keep them there (again via bios) and replace TIM on CPU block with something high quality such as Kryonaut paste (watch a youtube vid on how to clean old paste if u do not know how). If this solves the issue you know you had a pump/fan speed issue.. or the TIM was bad... or it was a bad block mount onto the CPU.

Also check your temps with HWMonitor and CoreTemp just to make sure your current readings are correct.

Also high five for using all Noctua fans. Brown. The colour of droppings. The colour of quality. Those PPC fans mean business.

Not sure if you missed the paint that its fixed now?

Since the H100i was out of warranty is took it apart

The block was full of crud, apparently a common problem. So I have cleaned it out, refilled it with a mix or water and anti freeze and will give it a test today.

On the subject of airflow lude did comment on it however never responded when I asked why

Your comment re airflow is interesting and may well give that a try, thanks