alt Hacker News> Apple Silicon changes the physics. The CPU and GPU share the same physical memory (Apple's Unified Memory Architecture) ... no bus!
Beware the reality distortion field: This is of course how it's worked on most x86 machines for a long time. And also on most Macs when they were using Intel chips.
Why did all my x86 onboard iGPU reserve a fixed amount of RAM on boot, inaccessible to the OS? Why do dGPU bring their own VRAM and how to directly manipulate it from the CPU without copying?