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Laptop idle temperature 20C higher when connected to eGPU

Eat Soup
By Eat Soup
in Laptops and Pre-Built Systems
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My laptop CPU idle temperatures increase from less than 40C to 60C when connected to my eGPU (Razer Core X with RTX 3060 12GB via Thunderbolt). The laptop without the eGPU idles at 40C when it is plugged in and running on battery. When idling, the fans don't spin up when plugged in, on battery or connected to the eGPU, despite the differences in temperature. The temperature readings also seem to be accurate as the laptop surface is far hotter to the touch when connected to the eGPU compared to without it. What could explain this difference in temperature?

 

For context, my laptop is an Intel NUC M15 (i7-1260p with Iris Xe graphics, 16GB 5200mhz LPDDR5, 1TB NVMe SSD).

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