Weird temperature readings

[ajgringo619]

After noticing some really high temps when stressing my system (mostly coming from Folding@Home), I took my case apart and did some routine maintenance - blew out a ton of dust, made sure all of the fans were working correctly, and applied new thermal paste to my CPU. So far, the readings are much improved; the CPU temps stay well below 40°C when they used to be close to 60°C.

The one thing I can't figure out is the Intel PECI sensor. It's been really hot here - 90-95°F consistently for about 2 weeks. After running the PC for 6 hours, I noticed that this sensor was reading something insane: -128°C! This actually showed up after I took the system out of sleep (for about an hour). Here are the complete sensor readings:

Code: Select all

k10temp-pci-00c3
Adapter: PCI adapter
temp1:        +22.5°C  (high = +70.0°C)
                       (crit = +80.0°C, hyst = +77.0°C)

it8728-isa-0228
Adapter: ISA adapter
in0:          +0.92 V  (min =  +0.00 V, max =  +3.06 V)
in1:          +1.49 V  (min =  +0.00 V, max =  +3.06 V)
in2:          +2.03 V  (min =  +0.00 V, max =  +3.06 V)
in3:          +2.00 V  (min =  +0.00 V, max =  +3.06 V)
in4:          +2.00 V  (min =  +0.00 V, max =  +3.06 V)
in5:          +2.22 V  (min =  +0.00 V, max =  +3.06 V)
in6:          +2.22 V  (min =  +0.00 V, max =  +3.06 V)
3VSB:         +3.31 V  (min =  +0.00 V, max =  +6.12 V)
Vbat:         +3.17 V  
fan1:        2376 RPM  (min =    0 RPM)
fan2:         965 RPM  (min =    0 RPM)
fan3:         806 RPM  (min =    0 RPM)
fan4:        1119 RPM  (min =    0 RPM)
fan5:           0 RPM  (min =    0 RPM)
temp1:        +35.0°C  (low  = +127.0°C, high = +127.0°C)  sensor = thermistor
temp2:        +64.0°C  (low  = +127.0°C, high = +127.0°C)  sensor = thermistor
temp3:       -128.0°C  (low  = +127.0°C, high = +127.0°C)  sensor = Intel PECI
intrusion0:  OK

fam15h_power-pci-00c4
Adapter: PCI adapter
power1:       27.91 W  (crit = 125.19 W)

It's an old motherboard, so I'm inclined to replace it. Should I be worried?

[deepakdeshp]

With hardware I always follow let it run if the performance is satisfactory, because if you wait say 2 years, your money will get better hardware for the same amount 2 years ago

[rene]

[ .. ] I noticed that this sensor was reading something insane: -128°C!

Binary speaking, that's in fact a very sane number. Note that -128=-2^7 and (thereby) the smallest integer that can be represented as a two-complement signed 8-bit byte. That is, from the value alone it's immediately clear that the sensor is simply not connected in your system, or that the Linux driver hasn't caught up with your actual hardware; that's usual for something like sensors, don't worry.

[EDIT] After noticing your footer I'd double up on above: PECI deals with on-die sensors and as such, "Intel PECI" would seem rather inapplicable to an AMD FX-8350 indeed.

[ajgringo619]

Thanks, everyone. Not sure how I missed the Intel part! The system is running great, so I'll marked this as solved.