I was just looking at the TechPowerUp review of the RX 5700 for this same reason tonight.
I can get an EVGA triple-slot single-fan RTX 2060 Black for $299 - $20 MIR, or an ASRock Reference blower RX 5700 for $329.99 right now @ Newegg, or a RTX 2060 Super for around $410-420, same price as a AIB RX 5700 XT.
I want the card for mining too, which, I hear, Navi 10 is not really good for that, and there's issues right now with OpenCL drivers, and even working at all with DC GPGPU applications.
Edit: I see, you're asking for OC versus OC comparisons, not Stock versus Stock as in the TPU review. With the idea that the NV card might have more headroom. (Really, the RX 5700 non-XT probably has a lot more headroom too, just that AMD "locked them down", quite a bit as I understand it.)
I'm looking to replace my two sets of RX 570 cards (one 2x 8GB, one 2x 4GB), primarily for mining, 2D 4K UHD display, and video watching (4K YT VP9), and some DC GPU apps too, and maybe a scant fraction of PC gaming, maybe at 4K UHD if it's feasible on whatever card I can afford next month.
Secondarily, I was looking for a "good" card, to pair up with an R5 1600 CPU @ 3.80Ghz, 16GB DDR4-2667@3000, and some RGB fan bling (tempered glass budget case), for a friend's kid. Something impressive, but not horribly expensive. Was thinking that $299 EVGA Black RTX 2060. PSU is also an issue for that build, I threw in a Corsair CX450, which has a single 6+2-pin, and wouldn't be good for the 8-pin PLUS 6-pin on the RX 5700 and RX 5700 XT.
(Is there an RX 5700 that only needs an 8-pin PCI-E, like the RTX 2060?)
Edit: Also spied earlier, a Gigabyte triple-fan RTX 2070 (non-Super) for ~$410 + ship, REFURB. Was that a good deal? It's sold out now.
I guess the 2060 Super, is basically similar to an RTX 2070, so if one could get a "real" 2070, rather than the 2060 Super, would one be better off?