Why are you comparing apples and oranges? Why not compare the RX 580 to the 1070 just because of the inflated prices of the RX 400/500 series? RX 64 beats GTX 1080 in DX12, RX 56 beats the GTX 1070 in DX12, RX 580 beats the GTX 1060 6GB in DX12, etc... And it even wins handily, usually 10fps faster on the newest version of BF1 and latest drivers!
The burden of proof is on you. You keep saying that AMD wrecks NVidia in BF1 DX12, but I haven't seen any evidence that it does. This is the most recent review I could find (a little over a week old) , and the AMD cards are more or less even with their NVidia counterparts. And this is with stock clocked GPUs. When you consider overclocking, the NVidia GPUs will jump past the AMD cards due to higher overclocking headroom.
Anyway, I'm thinking about picking up the game, so I will have the opportunity to test it myself.
 
				
		 
			 
 
		 
 
		 
 
		 
 
		 
	 
	 
	 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		
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