To answer your question: yes. It does matter - has to be 1920x1080. DSR works by creating the frames at 4x, then downsampling them to 1x, which in the process smoothens all the edges much better than other methods.
To be honest, I'm quite surprised so many people are finding the 4x settings variant that much sharper. When I did it, it was a little bit sharper than my setup. But it introduced weird judder (like from the side-panels). But again, it wasn't THAT amazing. The 4x and the Oculus settings on lowest seemed to almost cancel out.
To be honest, I'm quite surprised so many people are finding the 4x settings variant that much sharper. When I did it, it was a little bit sharper than my setup. But it introduced weird judder (like from the side-panels). But again, it wasn't THAT amazing. The 4x and the Oculus settings on lowest seemed to almost cancel out.