So based on the available information I've come across, it appears that the following are likely to be true:
1. The more RAM you get, the more power will be consumed and battery life is worse, whether idling, performing light tasks, or performing heavy tasks
- thus 32GB M1 Pro consumes more power than 16GB M1 Pro
- similarly, 64GB M1 Max consumes more power than 32GB M1 Max
- this RAM capacity difference appears to play a larger role on battery life when reviewers have compared M1 Pro vs M1 Max, than specifically the SoC itself
2. At the same RAM capacity, M1 Max appears to use slightly more power than M1 Pro
- i.e. 32GB M1 Max uses more power than 32GB M1 Pro, but it appears to be a fairly small amount, perhaps 100-200 mW more at idle.
- when under graphics heavy load, M1 Max will probably use significantly more power than M1 Pro, due to more GPU cores, but it is unclear whether under CPU heavy load there will be as large a difference
3. At idle, the GPU power draw is negligible, and similarly under light load appears to be not significantly different between any of the SoCs
I am the first to acknowledge that this is my impression, and some of the data will be imperfect. But it is enlightening seeing:
1 - ~600 mW package power + 200mW DRAM on a 8c/14c/16GB base 14" M1 Pro (
https://forums.macrumors.com/thread...st-idle-load-power-draw.2320968/post-30596758) vs
2 - ~800 mW package + 300mW DRAM on my own 10c/16c/32GB M1 Pro (
https://forums.macrumors.com/threads/battery-life-on-m1x-pro-vs-m1x-max.2317578/post-30620174) vs
3 - ~800 mW package + 400mW DRAM on a 10c/32c/32GB M1 Max (
https://forums.macrumors.com/threads/battery-life-on-m1x-pro-vs-m1x-max.2317578/post-30622884) vs
4 - ~1500 mW package + 750mW DRAM on a 10c/32c/64GB M1 Max (
https://forums.macrumors.com/thread...st-idle-load-power-draw.2320968/post-30551266)
with all 4 machines playing 1080p youtube video in Safari. But of course there is measurement error in there, (particularly the 64GB M1 Max seems very high).
(I have included the DRAM power separately as that seems to vary independently to the other values and does not seem inclusive of the total package power reported by powermetrics)