Fury X was a severely bottlenecked card. In terms of perf/TFlop it was substantially worse than Polaris. Many of us expected (or at least hoped) that these bottlenecks would be eliminated (now that reticle size was no longer a limiting factor) and that the new hardware features would increase perf/TFlop to Maxwell/Pascal levels. That would have resulted in a competitive product.
Instead, we get what appears so far to be an epic disaster. The gaming benchmarks look very much like what you'd expect if you took Fury X and were able to boost the clock speeds to 1400-1600 MHz. Architectural improvements since then don't seem to have made any difference at all in ordinary gaming. The only thing I can think of that could possibly excuse this is if the Draw Stream Binning Rasterizer (tiled rendering) isn't active in the current drivers. Otherwise, it indicates that whatever bottlenecks held back Fury X are still present. The most likely culprit is the front end; we know from Linux drivers that there are still only 4 shader engines. And, as you noted, there are only 64 ROPs (GP102 has 96). It looks like the cut-rate Chinese design team that put together Vega (and Polaris) wasn't skilled enough to work around the limitations of GCN. Vega was
supposed to remove the 4 shader engine limitation but it doesn't appear that they were able to pull this off.
Another disappointment is clock rates. Pascal can easily do 1600-1700 MHz without substantially sacrificing efficiency, and easily overclocks to nearly 2000 MHz. In contrast, it looks like Vega barely clocks higher than Polaris. We were expecting 1600 MHz as the sustained speed, but it looks like this will only be obtainable on watercooled cards, if that. And the power budget is going to be obscene. "Typical Clock" for aircooled Vega FE is only 1382 MHz, which is barely better than Polaris 20 and far worse than the Pascal competition.
It's time for Raja to go. No longer can we make the excuse that he's just inheriting someone else's problems. Vega is his legacy, and it looks like it's going to cripple RTG for years to come. Enough. Get rid of Raja, get rid of the cheap Chinese design team, and reboot RTG in America where it belongs.