this post was submitted on 23 Nov 2023
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CPU1 handles almost everything about being a normal computer: booting, chipset, most of the I/O, etc. CPU2 is along for the ride and handles its own I/O lanes (PCIe) and whatever work the kernel wants to send to it. The load is not symmetrical, so if you have turbo enabled, CPU1 will be consistently boosting more than CPU2 as it is handling all of its tasks —> warmer CPU1. This is why “tandem” dual-CPU setups have CPU1 upstream in airflow from CPU2.