(02-16-2018, 01:33 AM)GoldenSun3DS Wrote: AA is just artificially smoothing out the edges. It's not adding extra detail/quality. Supersampling (rendering at 8K when you have a 4K display) actually runs it at higher detail and then uses that info to smooth out the edges/jaggies.
While most forms of AA aren't supersampling, SSAA is. In fact, that's what the acronym stands for: Super Sampling Anti-Aliasing.
Anyway, to expand on what ExtremeDude2 said: If you want to set a higher internal resolution, you can do it by editing the GFX.ini file manually or by creating game INIs.