I remember when I first saw this. Was amazing. Really cool to see it running in real time at higher resolution and framerate.
The bench is basically 2 minutes on the nose so I set Fraps to bench for 120 seconds. Hitting the bench key the moment the UE4 loading icon goes away results in very consistent results. Ends right after the cave scene on the moment it goes to black.
Vsync off and no fps cap:
1080P
Frames, Time (ms), Min, Max, Avg
10585, 120000, 56, 236, 88.208
1440P
Frames, Time (ms), Min, Max, Avg
7507, 120000, 39, 204, 62.558
I tried to get it to run at 4K on my 1440P display, using Nvidia DSR, but it wouldn't take. Might try it on my TV later on.
MSI GTX 1080ti Gaming X Stock / 4.2 6850K / 32GB 2666