Comment by molticrystal

For windows I saw something similar to this years ago. An experimental proof of concept driver that allows the creation of a ram drive from vram for NVIDIA cards. Sequential is fast as you'd expect, random has lots of room for improvement.

>GpuRamDrive

>Create a virtual drive backed by GPU RAM.

https://github.com/prsyahmi/GpuRamDrive

Fork with AMD support:

https://github.com/brzz/GpuRamDrive/