Batman: Arkham City
The Radeon HD 7970 GHz Edition tandem looks good in this game as well, even with the triple-monitor configuration:
Take note of the low efficiency of SLI technology at 3240x1920: the two GTX 690s are only 24-33% ahead of the single such card in average frame rate while their bottom speed is even lower.
The bottom frame rate is okay in Battlefield 3:
The frame rate is high enough for enjoyable play at any settings. SLI is efficient (47 to 66%), yet CrossFireX is better yet (95% and higher).
The CrossFireX tandem built out of two Radeon HD 7970 GHz Edition cards delivers an impressive performance in this game:
The two GeForce GTX 690s are ahead at 2560x1440, but the CrossFireX tandem wins at 3240x1920. Moreover, the single Radeon HD 7970 GHz Edition is somewhat faster than the dual-processor GeForce GTX 690, let alone the single-processor GTX 680, at the highest resolution!
Sniper Elite V2 Benchmark
The test from Sniper Elite V2 seems to require a lot of graphics memory and high memory bandwidth. Particularly, it needs over 2.8 gigabytes of memory at 3240x1920 with enabled antialiasing, which explains the failure of the Nvidia-based solutions. The Radeons try to cope, yet their frame rates are low, too. When antialiasing is turned off, the game is satisfied with 1.4 gigabytes of memory and the Nvidia-based products can deliver high performance even with our triple-monitor configuration. AMD's solutions are faster, though. It is only at 2560x1440 that the two GeForce GTX 690s are on top.
Here’s a table with the full test results for your reference: