According to his testing, simply having a device plugged into a TB port is enough to raise temperatures by about 10 degrees (even if the TB port isn’t used to provide power). The high power consumption of the Thunderbolt ports doesn’t appear to be driven by the actual bandwidth consumption of the connected devices the author tested a USB-C hub with keyboard and mouse + power attached on one port and a USB-C HDMI 2.0 adapter in the other. The selected correct answer provides graphs and charts demonstrating how the laptop throttles sharply when two peripherals are plugged in on the left side simultaneously. After a few moments, the CPU begins to throttle sharply as a way of reducing overall power consumption.įurther testing shows that plugging two devices in on the right side may send temperatures soaring, but apparently at least some MacBook laptops don’t respond in the same way.
Attempting to use both Thunderbolt ports at the same time sends the thermal sensors for the TB ports skyrocketing.
As the author notes, this can leave the system useless for doing anything else.Īccording to the chosen answer, the solution is not to charge your MacBook off the left-hand port if you’re using it for video. This reduces the amount of CPU performance available for other tasks, thereby reducing temperature. Kernel_task is a process macOS uses to schedule no_ops - periods of time when the CPU is processing null tasks (which is to say, deliberately processing nothing).
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