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Faulty CPU temperature sensor shuts me down

post #1 of 5
Thread Starter 
I am pretty sure it is the sensor. A few days ago my cooling fan literally dropped down with a clang after rotating at top speeds for over an year. In the beginning it would do it from time to time then all the time. Now I changed the fan carefully, and I am absolutely sure the indications are wrong. This is a Core Duo E6320 CPU at normal speeds, the temps of the both cores vary in the expected range (25-40 degrees at top load), but the CPU temperature (separate sensor) sometimes spikes unexpectedly to over a 100 while the both cores still show normal temps changing as expected with the cpu load. The spikes actually have nothing to do with the CPU load - they may happen when it is absolutely idle and once the temp indication spikes up it would not return to normal ever (I think it did sometime ago, but not anymore). Feeling stupid I even ran some tests and noticed that when a spike occurs loading the cpu more actually drops the temperature indication with up to 10-15 degrees. So, I am pretty sure this is a faulty sensor, but I cannot just ignore it - the system would shut down because of it sometimes, no need to say about the raging CPU fan which was actually the reason why my previous fan dropped of the board (well and me neglecting the issue I suppose). Anyway, does any body have any idea what to do?

My motherboard is Asus P5B, I still wonder if I should update the BIOS, I doubt this will help, but after exhausting all the other options I'll do that as well. I want to leave this as a secondary PC for VM-s and buy a new one and now I don't know how to stabilize it. I would happily buy a new CPU or a motherboard, but changing them both will, kind of, defeat the purpose (using this as secondary PC) and I am still unsure which one to blame - the MB or the CPU...
Edited by michaelelfial - 5/22/11 at 1:41pm
post #2 of 5
Try updating the BIOS first.
post #3 of 5
It could be a bios issue, my Rampage Gene III system also shows crazy high cpu temperatures with two latest bios versions.
Shinobi XL
(11 items)
 
Cosmos 2
(9 items)
 
Raven RV03
(8 items)
 
CPUMotherboardGraphicsRAM
Intel Core i7-3770K Asrock Z77 OC Formula XFX Radeon HD 7870 XT Kingston HyperX Predator 2400 MHz 2*4 GB 
CoolingCoolingOSPower
EK Supreme HF EK-VGA Supreme HF Windows 7 Ultimate  Silverstone 1200W Strider Gold Evolution v2.0 
Case
Cooler Master Cosmos II 
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Shinobi XL
(11 items)
 
Cosmos 2
(9 items)
 
Raven RV03
(8 items)
 
CPUMotherboardGraphicsRAM
Intel Core i7-3770K Asrock Z77 OC Formula XFX Radeon HD 7870 XT Kingston HyperX Predator 2400 MHz 2*4 GB 
CoolingCoolingOSPower
EK Supreme HF EK-VGA Supreme HF Windows 7 Ultimate  Silverstone 1200W Strider Gold Evolution v2.0 
Case
Cooler Master Cosmos II 
  hide details  
Reply
post #4 of 5
Thread Starter 
The funny thing is it happened gradually, now that I am remembering what happened and when. I'll upgrade and tell you the results, but this will take a few days of observation.
post #5 of 5
Thread Starter 
After updating the BIOS it looked fine at first, but ... well it did not help Apparently I am the lucky winner - the first person I heard of who has a CPU with faulty temperature sensor. What I am interested to know now is if there is any chance that this sensor is not in the CPU but on the motherboard? I certainly need to change one of them, but I may end up replacing them both. I dug in some drawers at home and the only cpu that fits 775 I have at hand is one celeron D. If what I know is true that generation differs in this area from the later ones (Conroe and further) and it will work even if the problem is on the motherboard - the thermal protection was introduced later (if I remember it right). This being a good news is also a bad one - will not help to make me sure which one is the faulty one - the MB or the CPU and the celeron is too slow, I am even feeling a bit ashamed to mention such a thing on this site heh.
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