CPU over 100c?

[chjade84]

So i just finished my new home computer which I overclocked right away, of course. Everything was running smoothly while installing the typical software for new installs, Vista x64 gave me 5.9's in all performance categories so I was happy. I watched the temps while idling and running Prime95 for a few minutes and things seemed good. CPU 22-25c; Cores 39c at idle -- CPU 35-40; Cores 50c at load.

Sounds ok right?

So I figured I would run Prime95 overnight to give it a workout and check for errors. When I woke up I checked it out and Speedfan and PC Probe II both reported the cores at 52c and the CPU at 110c! I turned of Prime95 and the cores dropped to 39c but the CPU stayed at 110c. Vista seemed to be running just fine though, and Prime95 had no errors after 8 hours. I figured something was up so I restarted and checked the bios temps. Bios said CPU was at 39c. I can't see an option for ECPI or whatever people keep talking about in bios that inverts the temps.

Shouldn't the computer have shut itself down if it thought it was that hot? I see no options for that in the ASUS bios either.

Clearly something is amiss. Any thoughts?

My Rig:
E8500 3.16GHz OC'd to 4.06GHz
Asus P5Q-E
ZEROtherm Nirvana NV120
4gb G.Skill DDR2 1066
EVGA GTX 260
2x 120mm (front and back)
1x 80mm (side)

Any ideas would be appreciated. I seem to get great insights reading these forums, hopefully I will get some more!

BTW: I built virtually the same rig for work but uses a smaller CPU HSF and a GT 9800 but it everything else is identical, both even OC'd the same and it runs nice and cool. 25c/35c idle 45c/53c load; left it Prime95-ing overnight also, was fine.

Thanks!

 

[Kari]

that's just some clitch, since the cores came down to 39 from 52 there's no way the cpu casing temp could be 110 as it is always lower than the cores themselves. thats a matter of physics, no matter what the sensors are reporting...

 

[evongugg]

Use RealTemp for temperatures. I agree with Kari.

 

[chjade84]

Thanks for the replies! I suppose I will just not worry about it. I put my hand next to the HSF and the air that was flowing through it was cooler than room temp. Maybe I can just blame it on Vista! I would use XP x64 but I want Direct X 10.

Thanks again!

 

[randomizer]

The CPU temp must be lower than the core temps. If it isn't, it's wrong. The fact that it isn't changing reinforces the fact that it's wrong.

 

[triggerhappy]

It sounds to me like maybe your app is reporting in fahrenheit? 110 would be be 43 celcius which is believable and by the time you rebooted and went to bios, it cooled down to the 39c reported in the bios.

 

[gbanasakis]

I have the same problem. I wrote to asus and they said that the problem will be fixed in a future bios version. After some search in asus member forum I found out that the problem is due to the computer selecting the wrong CPU temperature sensor. The correct one for the CPU (temperature sensor diode 2) is PI I2N3904 (This is definitely true for P5Q-E and my guess is that it is true for all P5Q series) . Sometimes the computer selects Thermistor 2N3904.

The solution is: When the CPU temperature exceeds 100 degrees, run the program called Speedfan. Select CONFIGURE | ADVANCE and select the chip " Winbond W83627DHG ...". At the top of the list, highlight Temperature sensor diode 2. At the bottom, select from the pulldown list "PII 2N3904". Check "remember it". Click OK.

This solves the problem until the next time the computer gets confused again.

Original info is here:

http://vip.asus.com/forum/view.aspx?id=20080927231047312&board_id=1&model=P5Q+Deluxe&page=1&SLanguage=en-us

 

[aeiouandxyz]

Asus has problems with their CPU temp monitering software. Occassionally, the readout says 110 C but I use Real Temp too and it says the normal temps.

 

[anartik]

Definitely realtemp... there has been a lot of speculation as to the exact number but tjunction is about 100C. I have been able in the past to drive my 8500 to 100C monitored with realtemp and once it hits tjunction the core shuts down pretty consistantly. The primary purpose of the temp sensors in the CPU is to protect vs monitor accurate temp. As I recall the closer they get to tjunction the more accurate they get.

 

[randomizer]

@aeiouandxyz: I don't know if ASUS PC Probe has been updated much since I used it many years ago, but I know back then it was temperamental when run alongside another monitoring utility. It would spike to impossibly low/high temps or even report no temp at all.

@anartik: Yes, it is more accurate when close to Tj Max. However, when DTS = 0 (meaning the reported temp is equal to Tj max), the actual core temp is not necessarily equal to Tj Max due to factory calibrations.

 

[JakeN]

If you will just disable the Asus PC Probe software, the problem will totally disappear. PC Probe has long been problematic. Asus is great on hardware but not on software!