> I know ancient iGPUs had that thing for setting the GPU memory size in the BIOS, but that's aaaaaancient and completely obsolete. If you still have that, just set it to the minimum value. The rest of memory will be unified.

I hadn’t used a PC in so long, I still thought that bios setting decided the division. TIL.

Lucky we have Asahi Lina to clarify the details.

It shows up as "Shared GPU memory" in Task Manager. What BIOS sets is the Dedicated i.e. reserved video memory in RAM.

e.g. My Ryzen iGPU reserves 2GB/32GB for itself (which Windows can't see) via BIOS and use 9 more as shared "unified" memory.