Again, ... if ya read the numbers in the TPU article twin 960s now or in the future is cutting a wide swath.... if it's slower than a 970 today, it's going to be slower than a 970 a year or two from now. I did way more $410 SLI 560 TI builds than I did $500 580 builds cause the twin 560 Tis were 40% faster and a lot cheaper.... with the 6xx series, the performance of the 670's made them the top choice..... once word of the 780 Ti came out, with the 4200 price drop, twin 780s made great sense. The 960 just doesn't cut it the way those cards did.
And again, "use" and "benefit from" are two very different things. Max Payne 3 "uses" 2.75 MB of VRAM at 5760 and 1080 and will not even install on a 2 GB card. Put a 4GB card in, install the game, switch it for a 2 GB card and you get same fps, same detail, and same experience.
From the above link:
The GeForce GTX 960 SLI is not just undone by its own shortcomings due to a lack of perfect scaling in some games, but in being a whole $70 costlier than a single GeForce GTX 970. The GTX 960 SLI ends up offering roughly the same average performance as a single GTX 970 across resolutions. You're, hence, much better off choosing a single GTX 970 to GTX 960 SLI; that is, if you plan on buying two of these cards outright. The GTX 970 offers close to 20 percent more performance per dollar than the GTX 960 SLI in 1080p and 1440p.
It goes on to talk about how 4GB would be advantageous at higher resolutions but this card in SLI already has trouble keeping up with the cheaper 970 at lower resolutions so I fail to see how that is in any way relevant.