Finally, we have three 1920x1080 displays in a 5760x1080 array. Unfortunately, none of the hardware at our disposal is fast enough to play at this resolution using the Very High quality preset, so we started testing at the Medium preset using FXAA and 8x AF.
Using less-detailed settings, our results look similar to what we encountered at 1920x1080 using Very High quality. The Radeon HD 7950 with Boost and Radeon HD 7970 both drop below 30 FPS, though the higher-end board's dip is very brief.
The frame rate over time chart shows us that even the Radeon HD 7950 spends most of its time above the 30 FPS mark.
Although we aren't able to speak definitively about the dual-GPU solutions, it is notable that Nvidia's GeForce GTX Titan records a fairly high frame time variance result. Subjectively, though, all of these cards (and combinations of cards) run smoothly. It'd seem that sub-20 ms 95th percentile results aren't high enough to adversely affect our experience in this game.
Is there room to bump up image quality even higher? We turn the settings up to High details, Low Motion Blur, 8x AF, and 2x SMAA.
Under this much more demanding load, only a few dual-GPU solutions and the GeForce GTX Titan manage to get anywhere near 30 FPS minimum. The real surprise is that the Titan does this with a performance floor of 31 FPS, which is better than any dual-GPU combo.
For some reason two GeForce GTX 660 Ti cards in SLI struggle with this benchmark, despite multiple tests and troubleshooting. The combo appears to have a problem with 2x SMAA; the frame rates rise significantly if we use TXAA or MSAA instead.
The frame rates over time show us what the minimum and average FPS chart already did, but in more detail.
A pair of GeForce GTX 660 Ti cards in SLI yield the highest 95th percentile frame time variance. And indeed, this is the combination that demonstrated the highest propensity for stuttering. Frankly, if you want to play at 5760x1080, stick to the Medium detail setting for smoother performance.