Great review, thanks.
Kinda proves what I knew all along about Navi; the clock speed / voltage / power use "curve" essentially becomes a wall over like, 1600-1700 MHz and 1.0V. The RX 5700 was just a tiny bit over its sweet spot, but very efficient. The RX 5600 XT (original bios) is the sweet spot for Navi and the Perf/watt is incredibly impressive as you'd expect from the 7nm new-arch.
With the OC, this card is a very solid performer but I admit I was a bit "annoyed" by the 6GB of VRAM, though if I'm brutally honest, as W1zzard mentions it's not really a problem (yet). The problem I have with the Red Devil here is the price of $310, I would say (this is my opinion) I would just prefer to buy an RTX 2060 for the same or a tiny bit less money.
This was the problem I had with RX 5700 XT vs RTX 2060 SUPER: The Navi-card is faster in "normal" games, yes, but it is not faster by an amount you will really notice. However, for the same price you will notice the RTX and VRS going forward in newer games. In addition, I think OC RTX 2060non-super will close the gap a bit just like 2060SUPER OC did to 5700XT.
Not to "bash" AMD Radeon, but I feel this card is a "little" overpriced, but this is my opinion lol, and I'm just typing what I feel if I was in the market for this graphics card.
The energy efficiency is great to see, though! That's why I loved my 5700, it's nice to have Radeon competing (and beating) GeForce on perf/watt, but I kinda expected it from aforementioned full-node advantage vs Turing.