Can motherboard sensors be wrong about CPU temperature?

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darker246

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Jun 15, 2015
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My CPU is at 80°-90° C temperature when idle, haven't played any games yet to test it but even in Chrome or some apps it never goes over 90 and is constanly in that level, only sometines drops to like 60-70 for a minute and then goes back. PC is never shutting down though and i even tested it with leaving it on for over 16 hours without a problem. CPU fan is blowing out relatively cold air, i would say something in between cold an warm. I had Athlon II X2 220 and now have Phenom II X4 945 95W but problem is the same for both of them. My motherboard is MSI 760GM-P21. Thanks in advance.
 
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Try another program like 'Coretemp'. I've had good results with this from back in my PC building days when AMD CPU's didn't always report the right temps in HWMonitor.

Also, when you upgrade from your Athlon II, did you use the same heatsink? Are you running an aftermarket cooler? Did you clean/apply fresh thermal paste when you upgraded?
80-90 degrees is very harmful for AMD CPU's. They usually shutdown at that temp. Safe limits are about 75 C max.
 
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They can depending on what program you are using. If you are using the motherboard's software monitoring program, that's likely your problem. You need a second opinion. Download and install HWiNFO64 and use that to monitor.

FYI CPUID's HWMonitor is notorious for giving inaccurate readings too.

 
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My cooler is stock Spire cooler. I used same thermal paste for both of them and it is fresh completely, applied today. This temperatures show in every monitor app, not just in HW. I know 90 is harmful but what is weird is that it never goes over 90 even after 16 hours of working, it just stays at that temperature and it is not shutting down. I even changed PSU in midtime but issue stayed the same.
 
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I installed this program next to the 3 i already had and there are same results. Also, i would like to mention that lately my PC started to immediately shut down when booting and this is happening 50% of the time. When i press power button for the second time it boots up normally. This is happening even after upgrading from 450W noname PSU to 500W brand PSU.
 
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You sure the programs are set to celsius and not defaulting to fahrenheit somehow?

90f = 32c

If it is indeed celcius, how much paste are you applying? Way too much can prevent heat transfer to the sink.

Powering down after a cold boot might be a separate issue. What psu models are they?
 
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i've seen tht stmt before, don't know if you made it or another poster, but i use hwmonitor for monitoring intel CPUs and compared it's temps to Intel's XTU readings, and they were always spot on. And this is on three different computers
 
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Several moderators have made that statement here so maybe that's what you are thinking of. Note I stated notorious, but not always. Lots of complaints out there with that program giving erroneous data. It depends on where and how your motherboard sensors are placed. Usually this is reflective of the brand more than anything else. For me with ASUS, it's always been an issue and with AMD builds even more so.
 
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since you mention ASUS boards, if you're running Asus' AI Suite III utility, that would explain quite a bit - it's been known to cause conflicts in BIOS - two of my rigs are running ASUS boards, and i ended up having to un-install AI Suite 3 - hell, asus even has a cleaner to fully un-install it in safe mode, after a normal un-install. Google for it, and you'll see what i'm referring to
 
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Oh I learned to not use a motherboard's crapware back in a 2002. I like to be the one dictating my PC, not the maker's software LOL.
 
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Temperatures are in celsius. I applied bean sized paste on CPU, and spread it with my finger little bit. PSU is brand new Raidmax Cobra 500W with 80% bronze certificate.
 
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Compared to pea size? Or more?

Just a pea drop is needed and no need to spread with finger. Or at least use glad rap over finger to prevent any skin oil contaminants.

Heatsink pressure is used instead of finger to prevent air pockets.

My guess atm is too much paste with air pockets. Heat isn't being transferred through the grease properly because there's too much.
 
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You could be right because i have very old stock Spire cooler, but again, i don't think there's any heat at all to be honest. Air coming out of it is cool, and all monitoring apps says that CPU is always at 84 (it was 90 on Athlon II) even right after the boot and PC works normally for hours without shutting down. I just haven't tested it in games yet but in Chrome operations and etc. it works just fine...
 
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Idle is too high.

Keep in mind gpu isn't used much while browsing or general uses. While gaming, if your gpu is an open cooler design where it dumps hot air inside the case your cpu cooler is going to have to deal with extra heat passing through the fans.
 
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I don't even have GPU. Anyways, CPU heat problem is now solved with new cooler. But one issue remains, and that's shutting down on boot. I don't know what to do anymore. And also i am having BSOD problem with ntoskrnl.exe. Text of BSOD is always different, INTERNAL POWER ERROR, UNEXPECTED KERNEL MODE TRAP, ...
 
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Specs:

Phenom II X4 945 95W
8 GB (4+4) RAM - Excelram 1333MHz CL9 + Samsung 1333MHz CL9
No GPU
MSI 760GM P21
Raidmax Cobra 500W
1TB Seagate Sata 3 HDD

I ran memory test and it reported no errors so i'll asume they are not the problem...
 
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PSU is brand new as well as CPU and RAM. I updated BIOS to the latest version. Don't know if it is the motherboard but most likely it is the drivers. Look at this thread i wrote about those BSODs:

http://www.tomshardware.com/forum/topicfromemail/id/3677723?userId=2009707&answerId=20851269&hash=2918fa94402b8a9a1e8baa4dcc81ebfaa3142595&xitiTracker=EPR-8809&utm_medium=email&utm_source=forum_email&utm_campaign=EPR-8809



 
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