>>313513751
Anti-Aliasing and SuperSampling increase VRAM usage.
AA enabled in some games rendering at 4k can double the VRAM needed.
Super Sampling is where you render the picture at a larger scale then downsize it to fit the native monitor resolution, so you can eat up literally any size of vram you want if you set the super sampling ratio high enough.
So if you have more ram you can make your picture sharper but 10gb should be enough for current headsets with some super sampling.