I don't know if I'd say way too weak, but definitely kind of weak. Vega 56 is roughly equivalent to a 1070, and Vega 56 is 8 tflops compared to 1.8 for PS4, so a bit more than 4x more powerful than PS4. The main problem I see with it is that 8 tflops is only 25% better XB1 X, sure it wouldn't be handicapped by a weak CPU like XB1 X is, but still. MS could just wait until 2020 and release a new APU based Xbox that is around 9 tflops for $500 and sell it alongside the older XB1 X at $250-300, able to play 9th gen games at 1080p vs 4K on the new 9th gen Xbox.
Yeah, that's exactly what I meant - that is way too weak for proper next gen jump.
7th to 8th gen jump was 8x (in numbers) or 10x (according to Sony in real perforamance) - and that was with just 2.25 more pixels, instead of 4x for native 4K.
Way, way too weak - even twice that is barely enough.
And yeah, I know how it looks now, but back in days most people were calling crazy everyone that thought PS4 would pack something similar to 7970m (it pretty much does).