The laptop manufacturers like marketing an RTX 5090 instead of the more accurate 5070. It's a simple reality that you can't cool 600W in a laptop case, but Nvidia selling laptop 5090 is complicit.

What are the actual chips? Of course it's not going to run at 600W but I would think you can run a 5090 at 150W and the performance will be better than a 5070 at 150W. Of course, Nvidia may not be binning the chips the way I would expect...

It's closer to an RTX 5080, I misremembered the number. Still, that's half the shader cores of a desktop 5090.

https://www.techpowerup.com/gpu-specs/nvidia-gb203.g1073

Nvidia is incredibly strict with the laptop and board partners on the design and marketing of the final product.