This is how APUs (which is what the PS4/PS5/Xbox) use memory, the RAM is shared between the graphics and compute units. This can be an advantage since memory is

This is how APUs (which is what the PS4/PS5/Xbox) use memory, the RAM is shared between the graphics and compute units. This can be an advantage since memory is quickly shared between the two (for example loading textures, etc). This is also useful in computers since adding more RAM also adds more VRAM