Ah yeah, maybe GPU only. Don't the MacBooks with the onboard discrete GPU have an integrated Intel GPU as well? I'd assume those ones physically power off the big daddy card when it's not needed.
They used to. That’s how they worked but it ended up more trouble than it’s worth. I think they stopped trying to switch it on/off during the Intel era (not sure) but there are no discrete GPUs in the M1 era so far.
