Achaios :
Case in point: GTX 780TI
The 780TI featured here runs at stock which was 875 MHz Base Clock and 928 MHz Boost Clock, whereas the 3rd party GPU's produced ran at 1150 MHz and boosted up to 1250-1300 MHz. We are talking about 30-35% more performance here for this card which you ain't seeing here at all.
Achaios :
Like I wrote above, the GTX 780TI they have here is running a stock which was 875/928 Mhz. A third party GTX 780TI such as the Gigabyte GTX 780TI GHz Edition that boosts to 1240 MHz, scores 13540 3D Mark Firestrike Graphics score, which is just 20 marks less or so than the R9 390X at 3D mark Firestrike performance results, and significantly faster than the R9 290X, R9 470, R9 480 and GTX 1060 6GB.
http://imgur.com/KIP0MRt 3D mark Firestrike results here: https://www.futuremark.com/hardware/gpu
The performance difference isn't nearly that great. I had a look at the GTX 780Ti "GHz Edition" reviews, and benchmarks showed it performing around 15% faster than a stock 780Ti when it wasn't CPU limited. 30% higher clocks does not necessarily equal 30% more performance. Assuming the cards used in these benchmarks were at stock clocks, then the best you could expect from the GHz Edition would be right around the GTX 970's performance level at anything above "low" settings.
Also, it should be pointed out that most 780 Tis didn't run anywhere near those clocks. You can't take the highest-OCed version of a graphics card and imply that was the norm for third-party cards. And if we take into account overclocked versions of the other cards, then the overall standings probably wouldn't change much. The 780Ti likely just isn't able to handle DX12 as well as these newer cards, particularly AMD's.
It might have been nice if this performance comparison also tested DX11 mode though, since I know Nvidia's cards took a performance hit for DX12 back at the game's launch. I was also a bit surprised to see how poorly Nvidia's 2GB cards fared here though, while AMD's seemed to handle the lack of VRAM more gracefully. The 2GB GTX 1050 dropped below 30fps for an extended length of time even at medium settings, and all of Nvidia's 2GB cards plummeted to single digits at anything higher than that. Meanwhile, the 2GB Radeons stayed above 30fps even at high settings. It kind of makes me wonder how these 3GB GTX 1060s will fare a year or so from now, especially when you consider that the RX 480s and even 470s all come equipped with at least 4GB.