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If you want to buy used, to be safe get the 290/X.
Many are going around for that price used, they support DX12 async compute also, and they are in par with the 390/390X clock for clock.
However WoWs runs on single CPU core atm. What's your CPU?
I have a 2500k with a 290 and it shreds world of warships at 1440p. Stock clocks.
Good info, cheers m8, seems I need to keep an eye on the MM.