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CPU at 98 degrees

post #1 of 12
Thread Starter 
I was doing a stability test overnight with LinX. When I came to look at it in the morning, I was horrified to see that the CPU temps had spiked to 98 degrees. The test failed at some indeterminate time during the night, and it appears that the temperature threshold I had set in LinX did not work, so I have no idea how long the CPU spent at this temperature. Normally temps are in the mid 70s. Looking into the cause of the problem, I see my CPU fan had just stopped. Upon rebooting the machine, the CPU fan spun up no problem. During the run, I had on RealTemp, Speedfan, CPU-Z, Asrocks Fstream utility for it's hardware monitoring and Open Hardware Monitor. Speedfan fan control was not set to automatic. CPU fan speed control is under automatic control by the BIOS.

I rebooted the machine and the fan spun up with no indication of a problem and reached and sustained its maximum speed of 1300rpm (it's a brand new Noctua NF-P12 on a Venomous-X heatsink).

What's your collective opinion?

1. Given that temps might have been high for an extended period, what's the chance I have damaged my CPU?

2. I have a crisis of confidence now in my CPU fan. Do you think the cause of the fan stop is more likely to be a problem with the fan or a problem with the motherboard or some software glitch that stopped the fan somehow?

I'm going to add a second fan to the heatsink for some measure of redundancy, but I'm seriously disinclined now to do any form of unattended stability test.
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post #2 of 12
Dont worry about the CPU it will have controller its voltage in order to prevent damage, If you download HWMonitor and you will be able to see the min and max fan speeds over a give time. I think that you might have a bad mount on the heatsink personally.
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post #3 of 12
Thread Starter 
Quote:
Originally Posted by andrewmchugh;15211775 
I think that you might have a bad mount on the heatsink personally.

The mount is fine. The problem is that the CPU fan stopped spinning entirely. No heatsink known to man can passively dissipate the heat from an overclocked CPU running a Linpack suite. As long as my CPU fan is spinning, the temperatures are perfectly ok and don't exceed the mid 70s.

EDIT: I am also running Open Hardware Monitor. It's functionally identical to HWMonitor.
Edited by complexlogic - 10/7/11 at 4:53am
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post #4 of 12
Do you have a second mobo header for the fan? Can you plug it directly into your PSU?
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post #5 of 12
Probably heatsink wasn't seated properly, But temps are down to normal now?
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post #6 of 12
Thread Starter 
Quote:
Originally Posted by rdfloyd;15211897 
Do you have a second mobo header for the fan? Can you plug it directly into your PSU?

Yep, I do have a second header. In fact I'm going to add a second fan to the heatsink for a measure of redundancy. I'm even tempted to connect the second fan to a PSU molex to make damn sure that it will always be on.

I'm really trying to work out why the fan stopped. The BIOS knew that it was off, as the fan RPM was reported as zero. What's more likely - a motherboard glitch or a faulty fan? The perplexing thing is that the fan restarted no problem when I rebooted.
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post #7 of 12
Thread Starter 
Quote:
Originally Posted by AMDrocks;15211913 
Probably heatsink wasn't seated properly, But temps are down to normal now?

Guys, please read my post. This is not a heatsink seating issue. The CPU fan STOPPED spinning. That's why the temps ramped up so quickly.
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post #8 of 12
Quote:
Originally Posted by complexlogic;15211925 
Guys, please read my post. This is not a heatsink seating issue. The CPU fan STOPPED spinning. That's why the temps ramped up so quickly.

Chill.

I know there is software that will emit a warning tone when fan RPMs are below a certain threshold. Plug the fan you have now into the second fan header and run Lynx again. This time, monitor the fan speed. If it works fine, then the first header you used was bad. If both of them give the same problem, then you might have a bad fan.

What I would do is take a spare 120mm fan from your case and somehow attach it to your heatsink. Plug that fan into the PSU so you know the fan won't stop. Then use the fan from the heatsink and set it where you can watch it spin. If it constantly cuts on and off, then you know you have a problem.
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post #9 of 12
Intel spec says Tcase for your i7 2600K is 72.6C. Assume temperature of the cores is 10C higher than that of the IHS, then it is about 83C. When the fan stopped, temperature rose fairly quickly (to a max of 98C) and safety feature (eg Thermal Throttle) of your CPU kicked in. So, I suppose your CPU is not damaged.
Intel link: http://ark.intel.com/products/52214/Intel-Core-i7-2600K-Processor-%288M-Cache-3_40-GHz%29

As to why the fan stopped, I think it is not due to a faulty fan. It is unlikely a fan fails without any warning sign . And its spinning properly again also hints that it is not defective. I cannot guess the culprit but I would advise connecting both the fan (and perhaps a second one) to the PSU. If you do use 2 fans and if one is connected to the motherboard and one is connected to the PSU, they will spin at different speed. This is not good practice and likely leads to premature failure.

Edit 1
If you wish to have ultimate protection against fan failure, perhaps Thermalright HR-02 is the one to get. It can fanlessly sustain Linpack for a six core i7 980X @ 4.17GHz.
http://www.xbitlabs.com/articles/coolers/display/thermalright-hr02_5.html#sect0
Edited by windfire - 10/7/11 at 6:00am
post #10 of 12
Thread Starter 
Quote:
Originally Posted by rdfloyd;15212037 
Plug the fan you have now into the second fan header and run Lynx again. This time, monitor the fan speed. If it works fine, then the first header you used was bad. If both of them give the same problem, then you might have a bad fan.

That's a good way of isolating the problem, especially in conjunction with a second fan that is attached directly to a PSU molex...monitor fan rpm over time on the motherboard attached fan
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