think of it like this. bios has it's power saving feature such as cstate, pstate and other things like ASPM, LPM on chipset/pcie/dmi. windows has core parking and power saving etc and you can access those option by tweaking registry to change demotion/promotion etc. within windows if you use TS, there is speedstep and cstate which you also need to turn them off. basically just turning one of them off may or may not work as each computer is different so to ensure they are all not controlling it, you disable them all. then you do a test you'll get maximum performance, anything else beyond that would be hardware side, SSD firmware, OS versions with it's NVMe drivers. overclocking CPU also wins because CPU is the central of everything so u get boost from pretty much everything which is why turning cstate off affects SSD performance.