Intel Motherboards : H170M Pro4S temperature problem???

Author: parsec
Subject: H170M Pro4S temperature problem???
Posted: 06 Jan 2017 at 1:50am

DoomcoreHC wrote: Hello! I bought a new pc and whenever I go to bios/uefi I can clearly see that CPU temp when idle is right from the start 45 celsius and goes to 55, that should be like working temperature under load. After some time temperature goes to 57.5 celsius and stays there. Than I enabled that fan works on full performance (1500 rpm) and temp stays the same, doesnt even change 0.5 celsius. I didnt update bios yet as I dont know is this hardware error, is motherboard sending out wrong data? I installed Windows and everything works find, no dropouts or throttling.  I didnt overclock anything, nor do I plan to do it. Also, first I thought that I applied too much thermal paste, than I removed it and 2nd time applied a bit less, but the problem remains. So, mbo temp is always around 29c and cpu (when idle) is 55 or 57.5c. Vcore is around 1,28! Any help is appreciated!!!! Specs: i7 6700k Noctua NH-U14S H170M Pro4S Kingston Fury DDR4 2x8GB 2133 mhz XFX RX 460 4GB DDR5 SSD 500 gb Samsung 850 Evo 550W Corsair RMx Fractal Design R5 Titanium Thank you!

You didn't mention the CPU temperature when booted into Windows, or whatever OS you use. I can assure you that the CPU temperature won't be like that after you've booted the OS.

This is not the first time we've heard of this situation, we've had users posting the same situation in this forum many times. Believe it or not it only seems to happen with the i7-6700K Skylake processors. I've been using an i5-6600K CPU with my ASRock Z170 board, and the CPU temperature is only about 30C. That's with a Noctua NH-D14.

I was skeptical about the higher CPU temperature while in the UEFI/BIOS that the i7-6700K users were reporting. Some of them showed proof of the CPU temperature, with a picture of the CPU temperature in the HW Monitoring screen. We were never able to find any problem or issue that caused the high temperature reading. It never changed with any of the UEFI/BIOS updates that were released for the various boards being used.

I now have an i7-7700K Kaby Lake CPU, with a Thermalright TS 140 Power CPU cooler. It's a single tower CPU cooler, and uses six, 8mm heatpipes. I replaced the stock 140mm fan with Thermalright's 2,500RPM version of their 140mm fans. So it is a high end CPU cooler.

The i7-7700K's CPU temperature in the UEFI/BIOS is in the low 50° C range. Finally, I saw this for myself. There is nothing you can do about this, it is normal for the Intel i7 'K' Skylake and Kaby Lake processors.

There are several reasons this happens:

In the UEFI/BIOS, the CPU is running at 4.0GHz. None of the CPU power saving options like Speedstep and C States are working yet, even if they are enabled. Also, the Windows Power Plan power saving features are not active while using the UEFI, which makes a big difference.

Try disabling all of the CPU power saving options and set the Windows Power Plan to High Performance, and see what the CPU temperature is when Windows is running.

The stock VCore of the Skylake and Kaby Lake i7 'K' processors is rather high compared to other Skylake and Kaby Lake processors. Yours of 1.28V with no OC is on the low side for an i7-6700K, but the VCore of my i5-6600K is 1.008V in the UEFI. That makes a difference.

There probably are other factors we are not aware of, such as what load is no the CPU when in the UEFI (which is not an idle situation) but all I can tell you is your CPU temperature in the UEFI is not abnormal for an i7-6700K. It won't be that high at all in Windows.