What is more important factor between CPU and GPU for worker performance?

I want to know what is more important factor for worker.
I heard that The size of SD card or Hard disk is less important.

but what about between CPU and GPU?
thank you ~!!

Currently the videocoin worker uses CPUs on x86 systems i.e. GPU is not used. On Raspberry Pi and Jetson Nano it uses HW encoders.

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my question being solved, thank you ^^