I7-4770K with Liquid cooling @ 46c - 50c idle

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yanta

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Oct 23, 2014
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Hello,

I know overheating is one one of the most asked questions on many forums, and I wouldn't be posting this if I wasn't at my wits end. I've tried everything except the right solution, but I don't know what the right solution is.

I have an I7-4790K running @ stock 4.0ghz. It's fitted to an ASRock Extreme 4 Z97, with 32gb G.Skill 2400Mhz DDR3, with a Corsair H100 liquid cooler. The case is a HAF 932 advanced with an 850w Corsair platinum series PSU. I have a 5 fan monitor/controller. All fans are set to 100% (so system is somewhat loud). The graphics card is a single GTX 660Ti.

There are two 120mm fans under the radiator which is top mounted blowing air up from inside the case to the outside. There is a rear 140mm fan venting air from inside to out. There is a front 200mm fan sucking air into the case and a side 200mm fan also sucking air in.

Ambient temperature is 18 degrees celcius / 64.5 farenheit.

At idle, the CPU is @ 46 - 50 degrees celcius. MB temperature reports 28 degrees celcius.

Under load the CPU runs in the mid to high 80's.

I had to upgrade because my Z77 Extreme4 died, and it ran @ 31 degrees celcius with the same hardware.

I removed the pump several times and cleaned and re-applied the thermal paste. I've ensured the pump is secure, I've got all cables routed through the back to provide good air flow through the case. Fans are clean not clogged with dust.

The only thing I haven't tried is to mount the fans between radiator and case top to pull the air through the radiator rather than push it, and that's because the screws don't fit the fans (They are made to secure to the radiator). But many of the videos show the same configuration as mine anyway.

Can anyone offer any suggestions? (Other than "just live with it").

Thanks
Tanya

Best wishes for the holiday season.
 
Solution
RunLuke
BIOS lies :)
http://www.tomshardware.com/forum/id-1800828/intel-temperature-guide.html
Your temps are fine, try RealTemp, CoreTemp (but beware you don't install the crappy adware during install) etc, see what they say.
"CPU temperature in BIOS is higher than in Windows at idle, because BIOS starts the processor at boot voltage to ensure that it can initialize under any conditions. The monitoring utilities provided by motherboard manufacturers on your Driver DVD reads CPU temperature. Thermal code can vary greatly between BIOS suppliers and version updates, and can be wrong by up to 30C. BIOS or CPU temperature may not be accurate."


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Hello.

Your mounting bracket on the rear of the mother board is probably not seated well or not turned the right way around (the groove has to point upwards, away from the GPU). It's a common issue and one I had too.
Try removing the water block and lightly touching the mounting bracket, if it moves you need to either turn it the right way around or find some spacers (I used rubber ones) so that it's firmly in place (the bracket isn't particularly good). That made the temps on my 4790K @ 4.8ghz fall from 50 idle to very low 20'es with all fans running (including radiator fans) at minimum RPM. Your setup is very much like mine.

Rubber spacers
IMG_2389_(1).JPG


This "groove" has to point upwards, away from GPU:
IMG_2390.JPG


Capture4.PNG

 
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Thanks for the speedy response.

I believe I have the bracket fitted correctly. It really only can go one way because of the screws on the motherboard CPU backplate.

In any case, I added some spacers, and like all Corsair stock installations, the bracket did have some wobble. (I looked at several install videos on youtube and you can tell they are all loose until the pump is fitted). The bracket is now quite secure.

This silly HAF932's CPU cutout is too small so every time I touch this I have to pull the motherboard out.

After refitting the pump; at idle, with ambient temperature now at 26 degrees celcius the CPU is running at 54 degrees celcius with all fans running flat out.

That is, adding the spacers either did nothing or made it worse.


 
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Maybe DOA and has air bubbles in it if everything is 100 %.
Pump running? Pump has power? Mounting screws really, really tightened? Not too much thermal paste?

The mouting plate, I don't mean flipped, I mean rotated, it is easily mounted upside down, there is only one correct way to mount it, and that is groove pointing upwards, towards the ceiling, away from GPU, if this groove points to the floor you will run hot, on my motherboard it can be mounted incorrectly, irregardless of the placement of the screws.
I've marked areas of interest, notice the difference? Green has the groove/gutout, red does not. Red is towards floor, green towards ceeling. Just making absolutely sure.
hodor2.jpg
 
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Yes, mine matches your picture. Screws are tight. Wiped the paste off again, added small amount, about small pea size, did not spread it.

Pump power connected and appears to be working. Lights on (set to performance mode - though since fans are controlled by a different controller, the pump mode should be irrelevant)

The H100 was in use with the Z77 ASRock Extreme4 with I7-3770K two days ago @ low 30's. It's been running fine for 2 years.

I have been monitoring my temps by going directly into the BIOS. To save having to do that I installed the ASRock A-Tuning utility. It says my temp is 34 - 37 degrees celcius. One of them is telling fibs, I'm inclined to believe it's the ASRock utility, and the BIOS is telling the truth.
 
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BIOS lies :)
http://www.tomshardware.com/forum/id-1800828/intel-temperature-guide.html
Your temps are fine, try RealTemp, CoreTemp (but beware you don't install the crappy adware during install) etc, see what they say.
"CPU temperature in BIOS is higher than in Windows at idle, because BIOS starts the processor at boot voltage to ensure that it can initialize under any conditions. The monitoring utilities provided by motherboard manufacturers on your Driver DVD reads CPU temperature. Thermal code can vary greatly between BIOS suppliers and version updates, and can be wrong by up to 30C. BIOS or CPU temperature may not be accurate."


 
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Solution


Oh, poo!

I'm so used to seeing temps in the 20's and low 30's in the BIOS on EVERY system I've ever had I just assumed that is what I would see on the new motherboard. And given both the 3770k and the 4790k are 22nm I figured there would not be much of a difference, and also taking into account the haswell refresh addressed some of the temp issues of the 4770k.

I get that the tdp on the 3770k is 77w and 88 on the 4790k, but I wouldn't have thought that 11w would translate into 19 - 23 degrees difference in the bios.

So ... Do you think it is safe for me to drop the fan speeds and let it run quieter without any danger? (I tried it before, BIOS temp creeped close to 60c before I reset fans to max).

What is also strange is my son is running a 3770k with and z77 extreme 4 in a phantom 820 case with a H60-Se cooler and his temps are sub 30.

I have my old NH-U9-SE cooler here. SInce I' have the system apart I might rip out the H100 and see what temps are reported with the old cooler.

thanks
Tanya


 
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I run my fans on the lowste rev possible on the radiator while idle and get from 20es to 30es, I think it's safe, but you have to monitor your temps and run a few benchmarks/stress test to see how hot you run under load. But monitor your temps from windows, not BIOS :) (btw, my bios seems true to actual temps)

If you run too hot and fear wrong temperatures reported you will be able to feel the heat rising from the radiator and you should see a performance drop (system monitor in windows, your ghz will drop because of thermal throtteling)
 
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Hi,

Well finished playing around (loosely - "testing"). All tests were at stock 4.0ghz with fans at 100% unless otherwise stated. Ambient temperature 30 degrees celcius at start of tests

Corsair H100 cooler.
With the radiator fans on the bottom of the radiator - BIOS 53 / CPUiD 43 - Under load CPUiD - 84
With the radiator fans on the top of the radiator - BIOS 52 / CPUiD 41 - Under load CPUiD: 81
With radiator fans on top and BOTTOM (I added two fans) - BIOS 45 / CPUiD 31 - Under load - 74

With the Noctua NH-U9-SE
With the radiator fans on the bottom of the radiator - BIOS 51 / CPUiD 42 - Under load CPUiD - 80
With the radiator fans on the top of the radiator - BIOS 50 / CPUiD 42 - Under load CPUiD: 78

Load was done with x264.exe (Avchdcoder), using 8 threads with CPU priority set to "Above normal" as well as running ffmpeg encoding a DVD (a typical load for my system)

Repeating the same tests with the Corsair with the 4 fans (2 top, 2 bottom), with the CPU running @4.2ghz..
With radiator fans on top and BOTTOM - BIOS 47 / CPUiD 33 - Under load - 75

I had to put the side fan on the motherboard's chassic connector because I ran out of connectors for my lamptron fan controller. It runs at 710rpm.

Interesting results. The H100 is not much better than a non-LCS in this system.
 
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Really? Windows program consistently around 10 degrees cooler than BIOS?

All I really learned is that having 4 fans on the cooler helped lower the temps and that the LCS was not that different from the Noctua after market cooler.

Although, I must admit, by the time I added the extra two fans, several hours had passed and the ambient temprature had probably dropped several degrees, leading to a misleading 31 measurement.

And I should have removed the the third line with the noctua.. that was from my second test with the Corsair.. Yes, that would seem wierd for such a cooler to have 4 fans 🙂

According to CPUiD, the temps are consistently 6 - 8 degrees over ambient, and as I said earlier, I tended to believe the BIOS before I would have believed software... But I have been schooled 🙂


 
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