I think I was talking about the wrong settings with my 750 ti earlier. It was 900p high settings with medium shadows only that was giving me a bit of trouble. Lowering ambient occlusion to medium gave me a framerate more in line with PS4 performance in Digital Foundry's video, although my 750 ti was running at 1320 MHz core and 6.6 GHz memory to do it; I'm a bit surprised it didn't blow up only running on power from the motherboard while overclocked like that.