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The video core GPU temperature can be read with the use of the terminal and the below command:
 
The video core GPU temperature can be read with the use of the terminal and the below command:
    +
<syntaxhighlight lang="bash">
 
vcgencmd measure_temp
 
vcgencmd measure_temp
 +
</syntaxhighlight>
    
The Raspberry Pi4 starts to throttle, reduce frequency, with temperatures over 85c. When flying the DC-3 Dakota at a steady cruse altitude, in a low scenery dense area, the core temperature was reported to be ~75c. This was with ambient temperature of ~24c. The temperature rapidly dropped to ~45c when the cooling fan was energized. There was no heat sink installed for this test. FlightGear was running in fullscreen mode on monitor 1 and terminal was running on monitor 2. Screen resolution was possibly 1024 x 768.
 
The Raspberry Pi4 starts to throttle, reduce frequency, with temperatures over 85c. When flying the DC-3 Dakota at a steady cruse altitude, in a low scenery dense area, the core temperature was reported to be ~75c. This was with ambient temperature of ~24c. The temperature rapidly dropped to ~45c when the cooling fan was energized. There was no heat sink installed for this test. FlightGear was running in fullscreen mode on monitor 1 and terminal was running on monitor 2. Screen resolution was possibly 1024 x 768.

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