I have a gen4 with Nvidia 3050, and with the newer cards/drivers the support for power states is actually decent. On arch I don’t need any of the trickery you used to have to do to power off the card, if the card is not used for some time (less than a minute) it properly shut downs, and powertop reports something around 9w of power usage if you don’t fire up the CPU for compilation or such. When a program needs it, it powers back on. You still have some of the Linux/Nvidia headaches (with Wayland etc.) but it’s much better than it used to be