There is a floor below which it will go straight to 0 (ie, nonfunctional).

The M1 Max is well below that floor at max wattage.

That floor is really, really low when you try to optimize for it. But the issue is that the M1 Max is at 5nm TSMC while the 3080 is on 8nm Samsung, so this isn't actually that impressive.

i doubt it'll even initialize.

These cards can run idle (e.g. desktop 2D mode) at about 15W, so it might run just fine.

Actual power draw depends on monitor resolution, number of attached displays, and refresh rate, though.

These cards idle at 15w while m1 max is yielding like half the performance at that wattage.

Sorry, Apple is clearly lightyears ahead. All they need to do is put out a chip with 48 of their gpu cores and they will beat the most expensive top of the line best ever performance gpu on the market… with a laptop-grade SoC.

The moment of truth will be Mac Pro. There they'll have all the freedom to spend as much electricity as possible and push computing to the bounds.