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No, but that is also not a function of Big Picture Mode exclusively, that's a function of Gamescope, Steam, and Linux as well.
I run Linux at home lately. I guess I'm just confused now because they don't sound the same anymore. But it's not that important. Have a good day!
If you run Linux and Gamescope then yes, you can do that, although it's probably not super useful to throttle a desktop processor.
Less power is less power! I undervolted my 9070XT to use significantly less power, but only lose around 2% performance. I guess I'll have to look into Big Picture Mode, haven't used it in years. I had been waiting for SteamOS for desktop to use those kinds of features seamlessly as on the steamdeck. Awesome!
You won't be able to undervolt your GPU from Big Picture Mode. You can't do that on Steam Deck either, you can only lower the TDP of the APU.
I didn't say that I would do that from Big Picture Mode, I was saying I already do that. I have a steam deck and am familiar with its capabilities, thanks!