Cputemp showing wrong temp

Fixit7 · 07-20-2016, 05:43 PM

Quote:

Originally Posted by enorbet

The thermal issue is far more important than mere temperature reporting, even though those numbers can be helpful in revealing the effects of improvements. Example - I recently bought a used Thinkpad T61p and there are several ways in which I know that the Core 2 Duo is operating within spec but that is by no means good enough for me. I want this Notebook to actually be a Laptop, something I can comfortably rest on my lap or chest when lying down. Beyond that a lifetime in electronics taught me that "Heat Is The Enemy" and experience proves it's validity in longer life and more stable operation. I will be absolutely shocked if I am unable to drop temps by at least 20 C. The ultimate arbiter though will be whether I feel I can avoid sterilization LOL.

Bottom Line - It is well worth hours of effort and many dollars (rarely exceeds $50-$60 USD) to get your system as cool as possible and is something I always do from the beginning by default. Who cares whether the resulting avg temp is 35C or 39C? As long as it does not feel hot to humans it is good design in electronics. Some stuff must run hot but Computers are not one of them. Otherwise, Cray would never have resorted to cryo-cooling and modern server farms would not spend the vast sums they do on water cooling. Maybe stop worrying and work to cool it instead.

You are right about heat. :-)

I had an HP laptop given to me.

When running it on a wood table, the heat from the underside scorched part of the finish off.

I took it apart and located the cooling fan.

Then I drilled some small holes right underneath to increase air flow.

Then I made a elevated stand to hold laptop.

And put a cooling fan blowing air at the underside of the laptop.

Lowered my temp by 20 degrees F.

enorbet · 07-21-2016, 11:14 AM

@ 273 - I have to basically agree with your last post at least for SOHO Desktops (Crays and server farms are hardly junk) and you obviouly take this seriously and have acted to improve the running state of your PC. Kudos!. While I am unaware of any CPU that will be damaged by a mere 55C (most are just shy of twice that) I contend that if that spec is accurate then it seems highly unlikely that any manufacturer with billions of dollars at stake, would ever deliver a CPU/HS/Fan combination that would ever allow even 45C to be reached in the most strenuous of Earth's climates. To produce such a device would be the equivalent of suicide and sowing salt on the grave.

enorbet · 07-21-2016, 11:23 AM

@ Fixit7 - good job! I go a few steps further on laptops and level and polish the heatsink surface and replace what is most commonly that ridiculous foam pad with some silicone xfer grease in it and a layer of double-sided tape on both mating surfaces that makes assembly quick but is horrible cooling technique. I have actually seen some systems where HS and CPU don't physically touch! but those pads are often as much as 1/8 inch thick, not much better. Sometimes I can mill down mounting brackets to bring them close enough but on some I've had to resort to copper shims with a thin film of silicone grease on opposing faces but this results in massive improvements in cooling once sufficient airflow is guaranteed.

273 · 07-23-2016, 08:31 AM

The other day I upgraded my BIOS from "version 13" to "version 14a"(only available as a beta) in preperation for possibly purchasing an FX-8370 as only the beta BIOS supports it.
Now, it seems, the odd AMD sensor may actually give useable readings. In am ambient temperature of about 30C* when the machine is booted one sensor reports about 26C then, when under minor load (for example opening Icedove and updating a few packages with apt-get) it can rise to about 36C and with a little more load (VirtualBox and the like) it tends to hit 39C and stay there. That is until I use something like mprime when it will creep up to 60C or over but lower than the other sensors.
I am now begining to think that my CPU could be faulty in some way but the BIOS update does seem to make things more sensible.
I wonder whether part of the beta status was that Gigabyte were trying to make the sensor more useable inside an OS. Going by the dates of the BIOS though they stopped at the beta so I'm lucky if I get ans FX-8370 working at all.

Still, a possible mea supla here or, at least, I may be blaming AMD for a Gigabyte BIOS issue or, at least, a combination of factors.

*Sorry, I'll just use C as conversions seem a bit bulky.

273 · 07-30-2016, 05:40 PM

An update, after updating my BIOS and upgrading to the FX-8370 the temperature figures still look wrong but definitely point to some issue[s] with my old CPU. It seems that when AMD sensors do work they may be enough to show the health of a system, for comparison I'm running mprime with the included Wraith cooler and this is my output:

Code:

 sensors
it8720-isa-0228
Adapter: ISA adapter
in0:          +1.44 V  (min =  +0.00 V, max =  +4.08 V)
in1:          +1.50 V  (min =  +0.00 V, max =  +4.08 V)
in2:          +3.25 V  (min =  +0.00 V, max =  +4.08 V)
+5V:          +2.96 V  (min =  +0.00 V, max =  +4.08 V)
in4:          +3.06 V  (min =  +0.00 V, max =  +4.08 V)
in5:          +3.52 V  (min =  +0.00 V, max =  +4.08 V)
in6:          +4.08 V  (min =  +0.00 V, max =  +4.08 V)
5VSB:         +2.96 V  (min =  +0.00 V, max =  +4.08 V)
Vbat:         +3.33 V  
fan1:        2947 RPM  (min =    0 RPM)
fan2:           0 RPM  (min =    0 RPM)
fan3:           0 RPM  (min =    0 RPM)
fan5:           0 RPM  (min =    0 RPM)
temp1:        +39.0°C  (low  = +127.0°C, high = +127.0°C)  sensor = thermistor
temp2:        +52.0°C  (low  = +127.0°C, high = +127.0°C)  sensor = thermal diode
temp3:        +62.0°C  (low  = +127.0°C, high = +127.0°C)  sensor = Intel PECI
cpu0_vid:    +0.000 V
intrusion0:  ALARM

k10temp-pci-00c3
Adapter: PCI adapter
temp1:        +50.0°C  (high = +70.0°C)
                       (crit = +90.0°C, hyst = +87.0°C)

fam15h_power-pci-00c4
Adapter: PCI adapter
power1:      124.99 W  (crit = 125.19 W)

It seems I am wrong about AMD though I'm now suspicious about Gigabyte but that's another topic.
Apologies for posting so much.