why is 800mhz the lowest a CPU will go in power savings mode

Hardware limitation, likely the clock generation circuits cannot divide down lower than that:
https://en.wikipedia.org/wiki/Phase-locked_loop

The other explanation could be that at lower clock speeds maximum time between refreshes of dynamic memories could be violated (registers or perhaps DRAM).

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800mhz is all that is required to keep the hardware level botnet ticking over.

>>62216000

this is for kabylake