Isnt Strix Halo and apple's m series a bit different. Iirc you need to choose how much ram will be allocated to the igpu, whereas on mac it is all handled dynamically.
With Strix Halo there's two ways of going about it; either set how much memory you want allocated to GPU in BIOS (Less desirable), or set the memory allocation to the GPU to 512MB in the BIOS, and the driver will do it all dynamically much like on a Mac.
You can also change it manually on macOS [0], though yes by default itβs automatic but has a much lower limit (I think 2/3 is total RAM or something).
