I tried different drivers, 314, the newest official and newest beta drivers, and nothing seems to remedy this. I'm going to reformat and reinstall the game again tomorrow to see if I can kick this because dropping in half every couple minutes is annoying.

For reference, all my systems I use the Chocobo porter rides to monitor and tweak performance until I have as many options on as possible to stay above 60fps consistently. My two machines that aren't problematic don't have any kind of fps problems and even get a solid 40-50 in the aetheryte plazas.