BioShock Infinite
BioShock is fantastically playable and looks great on the PC. We benchmark a 45-second section near the start with all available eye-candy turned on.
BioShock Infinite starts to get a little choppy at 4K, but it's buttery smooth at 2,560x1,440, and GTX 970 seems a perfect match for a G-Sync-enabled QHD display.