What is the X29 Proximity (temperature) Sensor measuring? I'm on a 2013 MacBook Pro with Retina.

1 Answer 1


The X29 Proximity Temperature sensor is used to monitor the heat that the CPU is producing, likely at different locations inside the computer, hence the word proximity.

  • How does this differ from the "CPU analog" and "CPU digital" sensors?
    – lightbord
    Jul 27, 2016 at 2:17
  • @lightbord My guess is that the name "proximity sensor" means that it measures CPU heat at different proximities.
    – Munesawagi
    Jul 27, 2016 at 2:26

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