CPU overheating to 100+ C when doing anything. Random blackscreen shutdowns.

bjohnson155

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First, specs:
CPU: AMD Phenom II X6 1100T
GPU: MSI/Geforce N560 GTX Ti Hawk
Mobo: ASRock 970 Extreme3 R2.0
PSU: Corsair GS700
RAM: 2x Corsair XMS3 4GB DDR3
OS: Win 7 x64

Hi, some backstory on my CPU, I've used it since a previous build, most of my other parts were upgraded, but I haven't changed my CPU for a while. At one point over a year ago some of the pins (2 - 4) got slightly bent and I carefully unbent them and continued to use it. I've been having some issues with my setup for a while and they seem to be intermittent. Mostly, they revolve around having random black screen shutdowns with no error logs. I can sometimes go months without this occurring, but it always comes back. It started shutting down again recently, so I decided to check my temperatures and I saw that my CPU was hitting temperatures of 115+ C while watching netflix with other tabs open or playing games like Binding of Isaac (not even remotely close to a resource intensive game). I believe the issue is my CPU, even if it isn't there's something that needs to be done about my temperatures anyway.

Currently, I'm looking at my BIOS setup utility and the temperature of my CPU is hovering around 80C and slowly climbing. Clearly this is way outside the range of safe idle temperatures, so I'm wondering what I can do about this. I have taken out the processor and reapplied thermal compound (Arctic Silver 5) three times now with no change in temperatures. I did it three times because I was trying to see if the way the thermal paste was applied would affect anything. I tried a blob in the middle, I tried two lines, and I tried spreading it, each time being careful not to apply too much (Less than a pea, maybe a tiny bit more than an uncooked grain of rice). Each time when it failed to decrease temperatures and I took off the heatsink, the thermal paste appeared well distributed; close to the edges without going over and no bubbles or anything.

I'm thinking my CPU has kicked the bucket. It seems like it is the cause of all of this, but I've been wrong about the cause of my computer's problems before when they seemed very obvious. I'm wondering two things: Is there some way to monitor my hardware to know exactly what has stopped working when error logs are failing me? And is there a possibility that I am just applying the thermal compound incorrectly for some reason and my CPU will be fine if I fix that? It seems like 80+ C idle temps and 115+ C under "load" (hardly) temps are way too high regardless of my technique. Sorry for the long post, let me know if there's any other info that would help resolve my problem. Also, I've just thought of this now and I'm kicking myself for not thinking of it earlier since I've had to reapply it so many times, but if it's helpful I can unseat my CPU again and take a picture of my thermal compound distribution to make sure my technique isn't terrible.

Another thing, I live in Canada and winter is here, so outside temperatures are not contributing to the high temperatures of my CPU.
 
Solution
AMD Processor Specifications

The higher voltage is for a single core in Turbo with all other cores power-gated. 1.4v is the recommended maximum voltage for Ph-IIs.

Your motherboard is also a notorious 'over-volter' because of the 4+1 power phases. With Turbo disabled, you may be able to drop your VCore in the BIOS to 1.35v (or less) and still over-clock the CPU.

Because of the "over-volting motherboard" you may see higher reported voltages in third-party utilities. Example: 1.35v in the BIOS may be reported as 1.4v in Windows.

You should also enable Cool & Quiet, and consider using something like the PhenomMsrTweaker utility to set your P-States.

mo

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Your CPU needs to be replaced. Regardless of a less than perfect thermal paste application, the temperatures you mention are abnormally high indicating that your CPU is no longer usable. Grab a new one.
 
It really could be a defective CPU, but if there is a problem with thermal paste you can easily check: open your case and check the temp of your cpu cooler while your system is running by touching it. If your CPU is anywhere near 100 then the cooler should be hot enough to burn you. If the cooler is relatively cool when your cpu temps are high then there must not be a good thermal connection between them.
 

bjohnson155

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Yep, hot. Ouch.
 

bjohnson155

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Checking the BIOS setup utility it has the Multiplier/Voltage Change set to "Auto" and Processor Maximum Voltage is at 1.5500 V. Not really too familiar with voltage stuff for hardware, so I'm not sure what to compare with to see if that's good or bad.
 




Then I'm going to affirm mo: you need a new CPU.
 

bjohnson155

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Yep, looks like it. At least boxing day is coming.
 
Your CPU needs to be replaced. Regardless of a less than perfect thermal paste application, the temperatures you mention are abnormally high indicating that your CPU is no longer usable. Grab a new one.

Then I'm going to affirm mo: you need a new CPU.

Just wrong.

1.5500v is driving your high temps.

Take manual control of your voltages, and drop them to no more than 1.4v. If you must, disable the Turbo function.

 

bjohnson155

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That's interesting, if you don't mind could you point me in the direction of some resources that can tell me more about safe voltages to use with specific CPUs? Any Turbo functionality is disabled.
 

bjohnson155

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Now that I'm looking at it again, the 1.55 V is the maximum voltage allowed. Idle at the BIOS at 80+ C it is running at 1.424 V. I'll lower the max to 1.4 V but I don't think that it would have any reason to approach 1.55 V in the situations I outlined above. The CPU usage was never high in my resource monitor.
 
AMD Processor Specifications

The higher voltage is for a single core in Turbo with all other cores power-gated. 1.4v is the recommended maximum voltage for Ph-IIs.

Your motherboard is also a notorious 'over-volter' because of the 4+1 power phases. With Turbo disabled, you may be able to drop your VCore in the BIOS to 1.35v (or less) and still over-clock the CPU.

Because of the "over-volting motherboard" you may see higher reported voltages in third-party utilities. Example: 1.35v in the BIOS may be reported as 1.4v in Windows.

You should also enable Cool & Quiet, and consider using something like the PhenomMsrTweaker utility to set your P-States.

 
Solution

bjohnson155

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I think you're right, that makes a lot of sense now. After lowering it to 1.4 I noticed that HWMonitor has something to monitor the voltages for the CPU as well and even with the lowering I was still getting around 1.45 V, but my temp stopped climbing so much (still got to around 90 while playing games and watching netflix simultaneously to try to get it hot quickly). I still might consider getting a new CPU because I think this one actually has some problems, but I understand how to fix the temperatures now and it's useful info to know that my mobo was 'over-volting' my CPU so that I can avoid this in the future.
 
Drop back to 1.35v in the BIOS :)

I've got a PhII at 1.2875v (BIOS) reported at 1.3v in Windows, over-clocked to 3.8GHz using PhenomMsrTweaker to manage the voltages, multipliers and P-States.

Modern CPUs can take a lot of abuse, at least, short term. The CPU is likely fine, unless this has been going on for an extended period (a year?) of time.

edit: I forgot to mention ...

The ASRock 970 Extreme3 is known for its "issues" -- instead of a new CPU you may want to move the processor into a different motherboard with 8+2 power phases.

 

bjohnson155

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It's had high temperatures for quite a long time, just never this bad. Or maybe it was this bad for a while, but it didn't have any crashing, so I didn't notice. Either way, recently it's been freezing or failing to start after a black-screen crash occasionally and I think it's about time I upgrade anyway. Like I said, Boxing Day is soon, so I might as well take advantage of some deals if I can find them.

Are there any issues other than the over-volting? I might look into getting a new motherboard as well if that's the case.
 
Other than the 'power delivery' I am not aware of any. As long as everything else works (graphics card, USB, network, etc) it should be okay. It simply requires 'Extreme' voltage management :)

You will have the same voltage issues with a new CPU ... but now, you have an idea how to handle them!

 

mo

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Just Wrong?? 1.55 is the maximum voltage not the current voltage of the CPU and mind you OP did not even mention his voltages in his first post.

Regardless, if you check the specifications of OP's cpu the maximum operating temperature for AMD Phenom II X6 1100T is 62C. The temperatures OP is getting even @ 1.4v are way out of maximum range. The CPU needs to be replaced.