Originally Posted by TFL Replica
I don't know of any DX overriders that can do this in DX10+. GeDoSaTo was capable of providing custom upsampling in DX9 games, but it has been abandoned. The developer of ReShade (Crosire) has stated that it's not possible to do this with his utility.
Well. GeDoSaTo actually renders games on that custom resolution as native so it think it is different from what DLSS is trying to provide.