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Fans Stopped Without Me Noticing !!!

Hyper

Hyper

Hyper

Soldato
Joined
2 Jul 2005
Posts
3,549
Location
Newcastle
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 :eek:
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 :confused:
 
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 :).
 
smids said:
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 :).
Click to expand...
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.
 
Doesn't the bios report -124C once the cpu breaks 100C :eek: ? 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 :confused:

Atleast you've learned too set the cpu shut down temp and lukily not the hard way :p
 
melymel2789 said:
Doesn't the bios report -124C once the cpu breaks 100C :eek: ? 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 :confused:

Atleast you've learned too set the cpu shut down temp and lukily not the hard way :p
Click to expand...
Sure have, I have already lost my X800 Pro last year, dont want any more breakages :eek:
 
smids said:
Anyway, you are a bit lucky 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 :).
Click to expand...
Well on my Gigabyte motherboard I have disabled the CPU Shutdown Temperature monitor as it is useless as it doesn't 'kick in' until the CPU temperature reaches 110C and as my CPU can only take 85C, it would be fried by then anyway :eek:

I have enabled the Fan Fail Warning monitor though so if my CPU fan should fail, at least I will get a warning!

As a precaution I fitted an external 5" fan into my case panel which blows cool air on to my CPU, graphics card and Northbridge so in the event of my CPU fan failing, I would be okay as an alarm would sound and I would then turn my PC off immediately.
This external fan also helps with overclocking attempts as it helps to keep my components a bit cooler.

By the way, hyper7racer, you were very lucky not to have fried your CPU ;)
 
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My DFI CPU shutdown works fine and has kicked in before luckily for me - was just installing windows at the time and fan controller had failed to start up.
 
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.
 
mrochester said:
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.
Click to expand...
That sounds the most believable.
 
after putting heatsinks on the mosfets of my msi board my xp-m saw a more stabalised voltage with fluctuated far less and cpu temps were more consistant.
 
hmm, all at once, i would say some kind of electrical fault. Or fault of a fan controller if they are all passing through them
 
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