Fans Stopped Without Me Noticing !!!

[Hyper]

Tonight i was listening to music as normal on my Opty 146 @2.8ghz on 1.44V when my pc started looping the music i was listening to.
I let it do it a few times before getting up to reset my pc and then noticing all the fans in my case had stopped.
So i quickly turned my pc off and back on to check temps in the bios and at first the reported -124C (obviously to hot to record) so i turned my pc off again and back on and this time i got a cpu temp reporting of 74C
My fans were working fine though and the cpu started to cool back down to normal temps.
What could have caused my fans to go off and am I lucky to still have a working CPU ?

Sam

 

[Hyper]

No idea about the fans, probably the PSU or a fan controller malfunction - not what I came to comment on really.

Anyway, that aside, you are a bit lucky (check your clock stability again) but it could all have been avoided if you had set a CPU cut-off temperature in BIOS. This is under PC health status IIRC (bottom-left option) and then CPU shutdown temperature. Mine is set at 60C (watercooled) and this instantly cuts the motherboard out the moment the CPU hits that temperature. Set it in future .

Yes, i was pretty sure i had that set anyway, but i have set it now just to be sure.
60C and i have done a quick stability test on the same clock and it seems fine.

 

[Hyper]

Doesn't the bios report -124C once the cpu breaks 100C ? if s yes you are very lucky, a minute at this temp even killed my old 0.18nm celeron. Not sure how it could have happened as it sounds like a molex failure but you say there working again so maybe something decided it didnt want your fans on

Atleast you've learned too set the cpu shut down temp and lukily not the hard way

Sure have, I have already lost my X800 Pro last year, dont want any more breakages

 

[Hyper]

You don't need to set a CPU shutdown temp in the BIOS as all AMD64 CPUs have their own thermal protection circuit built in. They will automatically turn themselves off when they reach a certain temperature, which I believe is something like 95 degrees. I can confirm that your average Athlon64 is good up to at least 85 degrees. I experiement one day with unplugging the CPU fan on the stock heatsink and it eventually climbed to this temperature, and continued to work perfectly. It's far more like to be the power circuity that overheated as this is considerably hotter than the CPU in most systems, and it overheating causes the power to the processor to go haywire, and hence you get instability.

That sounds the most believable.