The boost speed is the max frequency the chip will run by itself.
The problem is higher frequency will result in more heat production. It can also require higher voltage so more energy usage for the same work.
So normally you run it a t a lower base clock speed.
There can be another limit and that is the amount of heat that can be transported away. For a CPU the boos frequency depends on the number of cores you run so more boost if 1 core is used to the max but less if 2 and even less for 8.
The limitation than to be the amount of heat that can be removed from the CPU.
Exactly how to boost speed work for GPUs is not clear to me but is could be so that it too is limited by heat. So the clock might be faster for some load that does not use all part of the GPU.
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