there is patch on linux where you can mark which allocated vram is important or something and then when you do it with games they have the full 8GB the rest goes to system ram i think, this makes games on linux run like 30+ fps vs Windows on systems with only 8GB VRAM,
https://youtu.be/cUJGvKHdDRo?si=q7VrGGpP3mDlLhKl&t=28