Cpu's heatsink off

Solution
That is most likely hardware failure, albeit the symptoms are quite confusing. Can you check out if this fan behavior only happens when playing, or also during normal Windows use? Do you have any software installed that reports CPU fan speed? What speed it is reporting when fan is not working? Any other fans affected?
That is most likely hardware failure, albeit the symptoms are quite confusing. Can you check out if this fan behavior only happens when playing, or also during normal Windows use? Do you have any software installed that reports CPU fan speed? What speed it is reporting when fan is not working? Any other fans affected?
 
Solution
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Yes this fan behavior only happens when playing, so not when using Windows normally. When the fans are not working the reported fan speed is 0RPM and I can't see any other fans being affected.

Thanks for the quick response.
 
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I'll try this now and get back to you, thanks.
 
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Just tried playing with manual fan speed set to full on and the fan still stops working and drops to 0RPM
 
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I think I have attached a quick labelled graph of CPU temp which I hope answers the question, the cpu fan almost immediately restarted when I closed the game this time.

Here's the link to the image if I didn't attach it right: http://imgur.com/j4leFmM

j4leFmM

 
It almost looks like the system was short on +12V power when GPU is at full load. Except it does not make sense, cos it would affect case fans as well.
Okay, small test then: connect one of case fans to CPU_FAN header and connect CPU fan to case fan header. Run the game and check if the problem moves to the case fan - we can exclude CPU fan failure this way.
 
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Okay I just tried that and found that the CPU fan wouldn't even start up after I changed them around, the case fan worked as usual and I made sure the CPU fan was properly connected.
 
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Yeah the two headers are 4-pins, the CPU fan is 4-pins and the case fan is 3-pins
 
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So it seems a new cpu fan would be the way to go, right ?