Is power saving mode in BIOS and Windows the same thing?

Question

Iron

Interestingly, I did not conduct tests myself, in the BIOS you can select 3 power supply modes, the same can be done in Windows. Is it the same or are they superimposed on each other forming a kind of derivative?

Answer 1

No, it's not exactly the same.
This setting allows the use of power saving modes for a number of pieces of hardware and the processor.
But Windows uses this setting.

Answer 2

For a long time I remember setting up a wake-up in windows by a timer, and I saw an enabled setting in the BIOS settings (that is, windows included this setting in the BIOS), but on another hardware, I didn’t set up a wake-up at all.
Most likely, this is purely individual for specific hardware and drivers installed on the system.

Answer 3

The answer is something like this: It depends on the implementation in the hardware.
At the lowest level, all power is controlled by iron, there are temperature sensors inside the chipset, as well as inside the processor, all this is controlled at the iron level, turning on the fans and emergency shutdown, you can’t do anything here. One level up, there is a BIOS or EUFI that provides an ACPI interface to which the behavior of certain devices is displayed, and then you can control them through windows.
The collection is generally small. Turn off the device, send it to sleep, receive signals from it in sleep mode, set the sleep mode. Plus, within narrow limits, you can adjust the processor frequency and dividers on the buses.
But in any case, hardware takes precedence.