Z170 Extreme 7+ reporting incorrect CPU temp
Printed From: ASRock.com
Category: Technical Support
Forum Name: Intel Motherboards
Forum Description: Question about ASRock Intel Motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=740
Printed Date: 22 Jul 2025 at 5:47am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: Z170 Extreme 7+ reporting incorrect CPU temp
Posted By: Vustadumas
Subject: Z170 Extreme 7+ reporting incorrect CPU temp
Date Posted: 31 Aug 2015 at 1:46am
|
Hey guys! Just finished up my Skylake (6700K) build a couple days ago, and I've noticed a problem with the CPU temp monitoring in the bios. It was initially reading as 100 degrees Celsius, which of course freaked me out. I pulled my water cooling off and re-checked my thermal paste. It covered the CPU just fine, and the contact between them was perfect. So I resat the cooling and booted back up. The mobo reported 47 degrees Celsius in the bios. Ok, better, but man, still way too high at idle. I downloaded HW Monitor so I could see a comparison. HW Monitor gives me a reading of 23 - 25 degrees Celsius per core, and an average of 27 degrees Celsius. I'm inclined to believe HW Monitor. Even under stress testing, the CPU barely pops over 60 degrees Celsius. Anyone have an idea what would be causing the misread? Possible my mobo has a bad sensor? Thanks for reading! |
Replies:
Posted By: parsec
Date Posted: 31 Aug 2015 at 3:24am
|
It might be a bad sensor, but the CPU temperature data is a very basic thing and the way it is accessed is well known and has been done for years, as you know. Also, programs like HW Monitor should be reading the same CPU temperature data as the board does and displays in the UEFI/BIOS. That would mean the sensor chip is not bad. OTOH, there is more than one way (sensor chip) to get CPU temperature data. In theory it is possible that the UEFI has a bug that is reading the wrong data or translating it wrong from the raw data provided by the CPU. I would try running a few different hardware monitoring programs, such as HWiNFO, which IMO is one of the best: http://www.hwinfo.com/download.php" rel="nofollow - http://www.hwinfo.com/download.php I would also try your board's A-Tuning program provided by ASRock and see how it compares to the UEFI and other programs. When in the UEFI/BIOS UI, none of the CPU power saving options (C States) are active, so the CPU is not idling in a low power state. If you run a monitoring program immediately after Windows starts, you'll see the CPU cores running at their highest speed, and after ~30 seconds they will change to their idle, low power state, if the CPU power savings options are enabled. That is why the CPU temperature will be somewhat higher in the UEFI UI. But 100C is way to high, and 47C is also more than I've ever seen while using a UEFI/BIOS UI. Unless the CPU cooler is not correctly. You might have found a bug in the UEFI, but IMO you should test that for a while before deciding that is the case. Did you try clearing the CMOS/UEFI, and then check the CPU temperatures in the UEFI and Windows? What UEFI version are you using? The latest version is 1.60: http://www.asrock.com/mb/Intel/Z170%20Extreme7+/?cat=Download&os=BIOS" rel="nofollow - http://www.asrock.com/mb/Intel/Z170%20Extreme7+/?cat=Download&os=BIOS ------------- http://valid.x86.fr/48rujh" rel="nofollow"> 
|
Posted By: Vustadumas
Date Posted: 31 Aug 2015 at 9:12am
|
Thanks for the reply! Running latest 1.60 Bios. Grabbed the HWInfo app, and it gives me the same figures as HW Monitor. Core #0 23 deg C 22 deg C (other cores pretty much the same) TjMAX is listed as 76 deg C, which it has never hit. No thermal events are listed. This is the same for the other 3 cores. CPU Package, IA Cores and GT Cores are at 25 deg C I'll test it with A-Tuning as well. Thanks!
|
Posted By: chris74flva
Date Posted: 27 May 2016 at 9:12am
|
I've noticed the same exact thing. I also just completed my personal Skylake i7 6700K system. My UEFI CPU temp shows 47 degrees Celsius. This is at idle! I'm using a Cryorig H7 CPU cooler w/ 120mm fan. The CPU lid is covered well w/ Arctic 5. Is it possible that a 6700K is running at idle at such a temperature? Could this be another 4770K story? ------------- the c |
Posted By: chris74flva
Date Posted: 27 May 2016 at 9:16am
|
Oh, I forgot to mention my motherboard is a Z170 Extreme 4. ------------- the c |
Posted By: parsec
Date Posted: 27 May 2016 at 11:03am
If you read my post above, you would know some of the reasons why your CPU temperature is 47C. I'll also add when the UEFI user interface is running, how do you know that is an idle condition? Do you know what the CPU usage of the UEFI user interface is? Does your board's OC Tweaker screen have an option called Boot Performance Mode? If it does, what is it set to? What is your VCore when in the UEFI? ------------- http://valid.x86.fr/48rujh" rel="nofollow">
|
chris74flva wrote:Posted By: chris74flva
Date Posted: 28 May 2016 at 1:23am
|
I was speaking to Vustadumas. ------------- the c |
Posted By: mrasd
Date Posted: 19 Dec 2016 at 9:41pm
| " rel="nofollow - Have you ever found a solution to the problem? I have a Z170 Ex 7+, a 6700k with a Kraken X61 and I get the exact same temperature in Idle in the BIOS :/! |
Posted By: Xaltar
Date Posted: 19 Dec 2016 at 9:52pm
In the UEFI the CPU is NOT idle, it is running in a diagnostic mode that puts some stress on the CPU. Temps in the UEFI should never be considered an idle baseline. The temps registered during idle from within the OS are the only ones that matter  ------------- 
|
Posted By: bezel
Date Posted: 28 Dec 2016 at 3:54am
|
" rel="nofollow - Thank You Xaltar for the explanation! I wonder why there is no such information in the manual or in the UEFI itself? AsRock should put it there! Users would know that their hardware is fine. It's stupid that we need to learn about things like that from the forum and not from the manufacturer... |