Just musing here... I wonder whether Navi's "scalability" will come later. As in, the first run of Navi will replace the RX 580 (well, 590 I guess) in mid 2019 after Zen 2 has had its time. And then in late 2019/early 2020, Navi will jump to 'doubling' the same core they've been selling and doubling the performance. So, if the most recent rumours (and combined with the original one where Navi was going to bring GTX 1080 performance to the $300 price point) are to be taken into account, that the working Navi silicon is exceeding expectations and is faster than a GTX 1080 slightly (hypothetically), doubling that would give you RTX 2080 Ti (faster in fact) performance levels. And it could be (again hypothetically) $600. Oh, the dream. $600 is the sweet spot. But actually $600. Not this fake $600 that's actually $750.