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What are you trying to achieve exactly?
Most power savings can be unlocked by modifying BIOS settings relating to CPU TDP, idle throttling, turbo profiles, memory clocks & timings etc.
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Power management on Windows is typically very good out of the box on the defaults, yeah you can squeeze a little more from it but it tends to surpass even Macs.
Beyond the obvious (dimming the screen of a laptop as a display brightly lit uses a high % of the power) the difference is not usually the power management settings, but what software is running. Windows can include a degree of bloat or convenience things, and the more software that is running the more the power is sapped.
For example, Edge browser is probably running in the background even if you're using Firefox or Chrome, and you need to start Edge and then go to
Settings > Systems and Performanceand then disableStartup boostandContinue running background extensions and apps when Microsoft Edge is closed... doing that stops one huge executable from loading when the OS starts and permanently running in the background.If you're going to go down any rabbit hole for improvements, using task manager to identify what is running and asking why it is running and doing something about it will yield far greater improvement than tweaking the power management settings whilst all of that stuff runs.
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ectoplasmosis
Velocio
@branwen
Is it worth fiddling around with Windows power settings to try and manage power usage on a Desktop PC? Or is that mostly just a fools errand