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Model A1311 / Late 2009 / 3.06 or 3.33 GHz Core 2 Duo processor

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GPU Heatsink temperature does not appear

Guys, is there any way to read the GPU Nvidia 9400m or GPU Diode temperature on the iMac? From what I remember, I could only see the temperature in the High Sierra.

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Are you using the latest versions of TG Pro?


@danj Yes, 2.89. From what I remember, I was never able to see the GPU temperature when installing a system above high sierra, using a patch.

In High Sierra I can see the temperature, but in Catalina onwards I can't.


@ramonferre18311 - What patch?


@danj At the time of Catalina it was the Catalina Patcher Dosdude1, and currently OpenCore Legacy Patcher, but if I install the official High Sierra I can see the temperature.


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Well… I think you found a weakness in the shim service as TG Pro (or likely any temp monitoring app) can’t gain access to the needed firmware API call.

I hit that too with a few custom Apps with OpenCore. Sadly I ended up rolling back to the highest Apple supported macOS my system could use.

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Ramon Ferreira will be eternally grateful.
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