CPU Temp Reading in BIOS Normal AB350?
Printed From: ASRock.com
Category: Technical Support
Forum Name: AMD Motherboards
Forum Description: Question about ASRock AMD motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=8830
Printed Date: 19 Jul 2025 at 5:58am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: CPU Temp Reading in BIOS Normal AB350?
Posted By: eddie55
Subject: CPU Temp Reading in BIOS Normal AB350?
Date Posted: 31 May 2018 at 10:07pm
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CPU: Ryzen 1600X (NO OVERCLOCKING) HSF: CoolerMaster Hyper 212X Motherboard: AB350 Pro4 Bios Version 4.7RAM: F4-3600C16D-16GVK (Running at 3000 with normal timings) My CPU temps inside in the BIOS are crazy.... they jump from any number between 54 C and 64 C while just idling in the BIOS with CPU fan at 100% ~ 2000 RPM and side panel off... Literally just watching the numbers jump from 54 to 64 C and any number in between up and down up and down... Is this reading accurate... never seen temps fluctuate by 10 degrees C going up AND down while idleing inside the BIOS If i applied my HSF improperly i would imagine i would have a constant high temp... but the temp keeps going up and down. Thanks in advance |
Replies:
Posted By: Reinvented
Date Posted: 31 May 2018 at 11:24pm
| Just FYI, it's not idling in Bios ever. There's going to be usage. |
Posted By: Xaltar
Date Posted: 01 Jun 2018 at 1:13am
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I have the same issue on my X370 Taichi using the latest beta BIOS. My temps report at a whopping 65c in the UEFI. I am confident that it is either misreading or it is not compensated with the offset it should be (-10c to -20c depending on CPU SKU). My system is water cooled. Regardless, I will say what I always do: unless you have abnormally high temps in OS, its safe to ignore UEFI temp readings. They are very often reported high (on a lot of boards from different manufacturers). Reinvented is correct, the UEFI does not represent an idle scenario. It loads at least 1 core rather extensively for it to function. The UEFI is terribly inefficient regarding resource usage, this is because it needs to fit onto a small ROM chip so the extra code that you would need to make it efficient is impossible to implement not to mention a potential source for issues. The UEFI is kept as simple as possible code wise to ensure maximum reliability. This means high load on the CPU and higher than normal (idle) temps. From my own testing I find the UEFI loads the CPU about as much as a modern AAA game title, the temps correlate. Again, nothing to worry about if your temps are in check in OS
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Posted By: VUMeter
Date Posted: 04 Jun 2018 at 2:21am
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1700X and X370 TaiChi (BIOS p3.10) here: In BIOS/UEFI the CPU isn't being taxed, but it isn't throttling down either. It basically sits in P0 state (max frequency) without any turbo boosts engaged. The vCore will naturally sit in safe limits, but will be higher than would be the case when idling in the OS due to being in the high P state. So, what you have in BIOS/UEFI is a CPU running at it's fastest native (all core) clock speed, and with adequate voltage to keep it there. Now, temperature reporting may be 20°C off. X series chips, and this may include the 1600X too, report as being 20°C higher than they actually are. This temperature is called Tctrl. Tdie is the actual CPU die temperature (or an average of all of them - it's the actual measurable temp) and this is the temperature that we should be monitoring always. There is another temperature sensor in the motherboard socket unofficially known as T-socket. In BIOS/UEFI, at least for P3.10, it will not show the Tdie temp, and it won't use Tdie for the control of the fans either - it uses the +20°C offset Tctrl temperature. This is fine, but it just gives a sense of panic. As above, check in the OS. HWinfo is a solid tool for listing all temp sensors in Windows. ------------- X370 TaiChi | 1700X P3.10 stock clocks | (2x 16GB) 32GB FlareX 2400MHz. https://valid.x86.fr/ikadaa" rel="nofollow"> 
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