The hardiest FR test I have come up with, for AH. Is to go offline, ndisles arena, switch to knight CV, wait until there is a lot of smoke from flack fireing at the drones, set on the deck with motor ideling, fire guns when there are 2 drones on the screen.
At this lowest FR point, I drop down to 33 FPS., with a GeForce 4 MMX 440. Its very playable.