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Windows 7: How hot is too hot for CPU? Sudden reboots?

13 Sep 2016   #1

win7pro 64bit
How hot is too hot for CPU? Sudden reboots?

During the last two weeks I observed sudden reboots of my Win 7 system.
In various, different situations the system crashed suddenly and starts afterwards automatically a reboot.

I verified possible software configurations and tracked it down to some hardware issues.
The only reason I can think of (currently) is that the CPU is getting too hot and triggers a self-protecting reboot.
Can this be?

May be the CPU fan is getting too much dust during the last months and does not offer enough cooling especially in heavy CPU load situations.

How hot is too hot for an Intel Core i5-2400 CPU?

Have a look at the attached snapshot of the famous CPUID HWMonitor tool.
Which of the mayn values is the important temperature value here ?

Or is motherboard the culprit?

Whats the critical threshold?

Attached Thumbnails
How hot is too hot for CPU? Sudden reboots?-temperatures.png  
My System SpecsSystem Spec
13 Sep 2016   #2

Windows 7 Home Premium 64-BIT

It depends on the place you are in.

Full cleaning should be done every 6 months (imo)
My System SpecsSystem Spec
13 Sep 2016   #3

Desk1 7 Home Prem / Desk2 10 Pro / Main lap Asus ROG 10 Pro 2 laptop Toshiba 7 Pro Asus P2520 7 & 10

I agree with Roaster and in fact I would even go as far checking everything out every three months especially if you live ain a dusty particulate environment.

Now I would not rely on just that soaftware for the readings as you can check them in the BIOS with Speccy
Speccy - Free Download - Piriform and in really in depth detail with HW Info - see my ditty
Using HW Info
You can test the volts on the PSU with HW Info HWiNFO, HWiNFO32/64 - Download < download the right bit version and close the right hand window select Sensors and scroll down to the power section where you will see what the volts are doing see my pic. In my pic the section (Nuvoton) with VBATT is a dead give away you are in the section for the rail voltages. There are other section titles and one that pops up often is ITE
Now the voltage on the different rails have to be within 5% =+/- of what is required or the machine will not work properly if at all.
12v = 11.4v min to 12.6max
5v = 4.75v min 5.25v max
3.3v = 3.135v min to 3.465v max
See this for the rail voltage info
PSUs 101: A Detailed Look Into Power Supplies (Section 2.)
The original right hand window shows the machine running and is handy for that but for looking at the components in some detail close it and use the main left hand side panel
Open each small square with + in it on the section the components are in and then click on the individual component/s (it will highlight in blue) - in the right hand side will appear all sorts of details including brands speeds and other essential info that particular device. See pic for example.

You can use the three opening screens or either use PART A: or B:

Edit use PART B: and then click sensors and the scroll down to the temps of say the CPU see pic

Attached Thumbnails
How hot is too hot for CPU? Sudden reboots?-hw-cpu-temps.png  
My System SpecsSystem Spec

13 Sep 2016   #4

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium SP1, 64-bit

Quote   Quote: Originally Posted by pstein View Post
How hot is too hot for an Intel Core i5-2400 CPU?
According to Intel, Tcase max temp for that processor is 72.6 C.

I see two temps in the 90s for "CPUTIN" and "AUXTIN". They apparently relate to the motherboard. I have no idea what acceptable temps are.

HWMonitor CPUID: What is CPUTIN, AUXTIN, SYSTIN and TMPIN3? - Apps - Apps General Discussion

Generally--the temps in the CPU section are 57 and lower, well within the Tcase limit--assuming they are accurate.

Tcase is the temperature measurement using a thermocouple embedded in the center of the heat spreader.

As I understand it, the Tcase limit is maybe where you start to raise your eyebrows, but the processor won't shut down until temps are considerably higher.

I wouldn't be so sure that your shutdown problems are heat-related.
My System SpecsSystem Spec
13 Sep 2016   #5

W7 Ultimate SP1, LM19.2 MATE, W10 Home 1703, W10 Pro 1703 VM, #All 64 bit

The AUXTIN temperature (94C) & CPUTIN (93C) look scary to me.

30 years ago when I worked as a tech, 50C was the maximum for non-MILSPEC components.

Modern components have a much higher temperature rating, but I still get twitchy if anything in my PC gets over 55C.
My System SpecsSystem Spec
13 Sep 2016   #6

Desk1 7 Home Prem / Desk2 10 Pro / Main lap Asus ROG 10 Pro 2 laptop Toshiba 7 Pro Asus P2520 7 & 10

Reading again when did you last renew any thermal compounds??
My System SpecsSystem Spec
13 Sep 2016   #7

Windows 7 HP 64

Any temperature above 80C has to be looked closer. CPUTIN and AUXTIN are above of what is reasonable.
I've seen on your specs that you did a overclock. What did you overclock? Did you overclock the main clock?
My System SpecsSystem Spec
14 Sep 2016   #8

Desk1 7 Home Prem / Desk2 10 Pro / Main lap Asus ROG 10 Pro 2 laptop Toshiba 7 Pro Asus P2520 7 & 10

Well I don't know about the others but could we have some of the other specs of the machine
System Info - See Your System Specs
I ask because that CPU was launched in 2011 which possibly makes the system and it would eb good to know what the mobo is for example and it may not be the CPU that is actually crashing.
My System SpecsSystem Spec

 How hot is too hot for CPU? Sudden reboots?

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