While researching how these scaler chips upscale I came across a new breed of scaler in the new Samsung Q9S 8K set. Now that has what appears to be a revolutionary scaler. It uses Artificial Intelligence, well, a learning algorithm to constantly improve itself based on what you watch. I think it probably uses RAISR,
To side track a bit more, I read that poor poor performance games (that drop to 45fps) can be brought back to as-fast-as-possible fps by turning off SteamVR's Reprojection
SteamVR Settings>Configuration>Performance>Allow Reprojection
I don't know if Brainwarp works on Pimax 8K yet but I wonder if that setting has an effect.