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I installed Macs Fan Control tonight, and everything is set to the defaults. This is OS X 10.8.5 on MacBook Pro.

The strange thing is that the GPU Diode temp (10°C) is lower than the ambient temperature (25°C). It starts about 8 and over time goes up and down a bit before settling around 20 after about 5 minutes. This happens even if the computer has been on for a while and gets restarted, so it is warmed up already.

I am wondering what this means? Could the sensor be faulty?

Macs Fan Control 1.4.4
MacBookPro8,2
CPU: Intel(R) Core(TM) i7-2720QM CPU @ 2.20GHz [100]
GPU: Intel HD Graphics 3000, AMD Radeon HD 6750M
Mac OS X 10.10.5

Fans:
Left side-min{2000}curr{2003}max{6200}mode{0}
Right side-min{2000}curr{1996}max{6200}mode{0}


TempSensors:
TB0T (Battery Max) - 31.3984, 31.3984
TB1T (Battery Sensor 1) - 31.3984, 31.3984
TB2T (Battery Sensor 2) - 30.6992, 30.6992
TC0C () - 46.625, 46.625
TC0D (CPU Diode) - 43.75, 43.75
TC0E () - 47.0312, 47.0312
TC0F () - 48.6836, 48.6836
TC0P (CPU Proximity) - 41.75, 41.75
TC1C (CPU Core 1) - 47, 47
TC2C (CPU Core 2) - 48, 48
TC3C (CPU Core 3) - 47, 47
TC4C (CPU Core 4) - 47, 47
TCGC (GPU PECI) - 47, 47
TCSA () - 40, 40
TCTD () - -1, 255.922
TG0D (GPU Diode) - 10, 10
TG0P (GPU Proximity) - 38.375, 38.375
THSP () - 36, 36
TM0S (Memory Slot) - 63.3555, 63.3555
TMBS () - -1, 0
TP0P () - 46.875, 46.875
TPCD (Platform Controller Hub Die) - 50, 50
TW0P () - -1, 129
Th1H (Heatsink Proximity) - 37.625, 37.625
Th2H () - 37.625, 37.625
Tm0P () - 34.125, 34.125
Ts0P (Palm Rest) - 31.5, 31.5
Ts0S () - 36.1133, 36.1133


Disk drives:
Samsung SSD 850 EVO 500GB - 31

Does this temperature change with time? Or is it always 10C ?

This model of the Mac switches between IGP and GPU graphics. My observation is that in case the GPU will be activated the temperature switches to
some meaningful value. You can try this by using the Tool gfxCardStatus. Maybe the GPU proximity sensor would give some more meaningful indication of the real
temperature of the GPU.

Cheers, Alex

Thanks, Alex for the info.

Which value is displayed when the GPU is switched?