Do not do this you have an AMD card. I have absolutely no idea what it'd actually do but I'd feel bad if something unfortunate happened.

Anyway, for me DLSS is typically greyed out in settings, but I managed to get my GTX960 to run it. When you look in the benchmark directory, there's a settings file called ffxivbenchmarklauncher.ini ; close the benchmark completely, change GraphicsRezoUpscaleType from 0 to 1, save the file, and reopen the benchmark. I'm still undecided on if it's better or worse, but there's no point hiding this away from users.

Here's a screenshot with the stats in the corner. End score is 7306 on near min settings fwiw.