When running @ 1440p with Ultra graphics settings, on average enabling SLI results in an additional 19 frames-per-second (an increase of 24.7%). Worth it? Even with a 144 Hz G-Sync monitor, probably not.
|GPU 0 Temperature||82° C||80° C|
|GPU 1 Temperature||37° C||67° C|
|Average Frame Rate||77 FPS||96 FPS|
Here’s the fancy output from the game’s built-in benchmark with SLI enabled.