2070 Super Clock Speed is 1879MHz Average:
https://tpucdn.com/review/nvida-geforce-rtx-2070-super/images/clock-vs-voltage.jpg
5700 XT Clock Speed is 1887 Average:
https://tpucdn.com/review/amd-radeon-rx-5700-xt/images/clock-vs-voltage.jpg
They both have 2560 shaders. They have the same ROPs and memory config. They are running at virtually the same average clocks at TPU. The 2070 Super is 12% faster here though:
https://tpucdn.com/review/amd-radeon-rx-5700-xt/images/relative-performance_2560-1440.png
Turing has higher performance-per-shader.
Navi is MUCH faster in DX12 and Vulkan in general, Nvidia still has slightly better DX11 architecture. It all depends how much DX12 is being adopted going forward, but judging from Steam hardware survey, 2 years ago win7 was at 50% rate and win10 at about 45% rate, these days win10 is at about 75% rate vs 25% rate of win7.
Navi has a much faster performance per shader in DX12 and Vulkan, though it obviously still loses on average in DX11 shader per shader performance.
I think it's inevitable that most future games (2020 and onwards) will be DX12 or Vulkan. Again with Nvidia's own push for ray tracing which requires DX12, I know that most games will be DX12 from 2020 and onward, especially as next gen consoles get released and they all use Navi architecture.
Great cards, to summarize everything up, the RX 5700 is essentially 5% faster than the RTX 2060 for the same price and consumes about the same power, while the RX 5700XT is 5% faster than the RTX 2060 super for the same price and a tad bit higher power consumption.
$350 RX5700 5% faster than RTX 2060, same power consumption. Clearly a much better buy, especially with the 8GB vs 6GB situation.
$400 RX5700XT 5% faster than RTX 2060super, 15W higher power consumption, a less clear choice, but taking into account Radeon Chill, FX fidelity, reduced latency in gaming, etc... the RX5700XT beats out the RTX2060s in value.
Temperature seems to be the only issue, but seeming as it is all over the place, it leads me to believe that some of the cards probably got slightly damaged in the transport and are not cooling the card properly. Its easy in these hot summer days and rocky rides for the thermal paste to lose a bit of contact and perform significantly worse.
Personally I'd take the RX 5700 and RX 5700XT over RTX 2060 and/or RTX 2060s because they are better value and because Nvidia is a scummy company that pushed gimpworks for decades that ruins performance in games in order to hurt the competition more, the GTX 970 3.5GB memory fiasco, the push to have partners use their "gaming" brands only with Nvidia and drop AMD(clearly an illegal move in Europe, anti competitive move) the GT 1030 with DDR4 fiasco with no way for consumers to know, essentially Nvidia committing fraud and a scam with the DDR4 version, and their endless push to increase prices to absurd levels, leading to $350 and $400
MID range cards.