Yeah Grumpy, even allowing both of my 780s to run with this game didn't improve performance at 2560x1440 as much as I thought it would. My CPU is a 3570k at 4.5GHz so I'm guessing it has something to do with that or the game is just poorly optimized? Idk.

Just an FYI, if you use NVIDIA there is a workaround to allow SLI support using NVIDIA Inspector. Just download that and add the DayZ.exe to the Arma3 profile and you're set.

Running SLI 780s and have the same problem. Thanks!