1) The Mac Pro is definitely not year-old technology; the CPUs were launched on paper in June and weren’t shipping in quantity until July or Aug. The Navi-based Vega II was announced in June along with the Mac Pro and is also brand new. The W5700X is announced but not shipping yet, it’ll be a nice option when available.
Vega II is not Navi based. the baseline for these cards is a year old.
https://www.amd.com/en/products/specifications/compare/professional-graphics/8291,8286
https://www.anandtech.com/show/1356...ct-mi60-mi50-accelerators-powered-by-7nm-vega
[ the MI50 has been bumped up to 32GB as of late. ]
It then got "downsided" and shipped again. Radeon VII ( stripped of Infinity Fabric , VRAM capacity , and downshifted fp64 performance. )
https://www.anandtech.com/show/13923/the-amd-radeon-vii-review
Apple's Vega II is a bit in the middle of those. But that was announced in June (with the Mac Pro).
Vega II has Infinity Fabric ( although slightly slower than the MI50-60).
the W5700X is Navi based and it isn't shipping yet. Apple appears to be at least 3-4 months behind on the driver curve so probably will be a couple months into next year for that. ( yes there are some Navi drivers now, but Windows/Linux respectively earlier too.
GPU wise Apple (and AMD) are a bit late. Navi was suppose to be earlier had major hiccup in Fall 2018 ... so it slid significantly deeper into 2019. By the time it trickled down the Mac uses it was very late this year.