What's the difference between the two? I can't vote if I don't know what clockspeed and how many cores the processors will be. Also can't vote if I dont' know how fast the GPU's are, or what kind of memory they have.

Also, there won't be a 4th generation Xbox. MS is slowly exiting the market. 

Scorpio easily. I don't want this gen to end anytime soon.

I am not very impressed with the spec it basically a small upgrade compared to the ps4 pro

Scorpio, 2018 is too early for the next Xbox or PlayStation.

There is room in the industry for both HBM and GDDR, 'till at least GDDR7.
IF a console were to use any HBM they would likely opt for a budget variant or try some monstrosity, hybrid with both GDDR6 and HBM2 or 3.

How can the 7800 class be high-end if there was also the 7900 class with several models faster than any 7800-GPU? 7950, 7950 Boost, 7970, 7970 Ghz and 7990.

The 7800 class was also almost 2 years old when PS4 lauched and it was already replaced by the R9-series by then. (R9 280x, 290 and 290x all launched before the PS4).

The 7800 class was also not in the $300 range anymore when the PS4 launched, it was in the $130 - $160 range at that point.

GDDR5 was used since summer 2008 as GPU-memory... so more than 5 years before the lauch of the PS4.

And we don't have to talk about the CPU of the PS4 + Xbox One, do we?

It was also ratified in 2016. GDDR6 was ratified in 2017.
HBM2 in Vega is going to have 409GB/s of bandwidth. So the low-cost HBM would be 327.2GB/s if it was on Vega. GDDR5X can push that. ;)

With that. It was only a proposal by Samsung. Not a real product.
http://www.anandtech.com/show/10589/hot-chips-2016-memory-vendors-discuss-ideas-for-future-memory-tech-ddr5-cheap-hbm-more

Vega isn't going to be shifting millions of GPU's. HBM2 will not take advantage of economies of scale. Vega is a high-end professional/enthusiast level Halo product.

People thought HBM1 was going to be the new "thing" when it debuted on Fury, Fury X and Nano. It didn't.

nVidia has more of a pull of where the industry goes than AMD right now. nVidia has more marketshare, sells more GPU's. Makes more money.

And thus far. You haven't provided any evidence that contradicts me.

HBM2 is still never going to be feasible in any console. Ever.

Scorpio's positioning was already understood even when it was just a rumour. It was a Halo product of the Xbox brand.

I am thinking more for lower power draw and board size, for use in something like a Playstation Swap (or whatever).
I did put a IF in my statement about a console using HBM.
And I know this is not 100%.

The size isn't as much of an issue in a console as it is in say... A notebook or a tablet though. And with chip consolidation how it is today, there is usually still plentry of room for movement on the PCB.

For a Micro-console though, then that's a different story just like how HBM enabled GPU's like the Nano for the first time.
But Microsoft and Sony will continue to go with components that make the most sense from a cost/power standpoint. It's why Scorpio is keeping it's Jaguar cores, GCN GPU and using GDDR5 memory rather than something like Zen, Vega and HBM.

"Vega isn't going to be shifting millions of GPU's. HBM2 will not take advantage of economies of scale. Vega is a high-end professional/enthusiast level Halo product."

It will once production ramps up, especially from 2018 onwards things will start to change in its favor. AMD is trying to gain marketshare and just like Ryzen they'll have products to seriously challenge Nvidia. It might not be until HBM3 when the tech will take off but today they groundwork's being laid out. The future of memory is HBM.

"You haven't provided any evidence that contradicts me"

Quote from your first post: "HBM will never happen in a console either. Way to expensive."

"Scorpio's positioning was already understood even when it was just a rumour. It was a Halo product of the Xbox brand."

Nah, we dont know how they'll position the Xbone X vs the PS5. If the Xbone X is old technology and still has to have compatibility with a newer box, the games will look far inferior to PS5 even on the new box. Second issue is it'll be too soon for any new product when the PS5 arrives. So 2 issues, regarding graphical performance and consumer satisfacion need to be addressed.  The "gens are over" is bullshit, I'm not sure why people fall for it. They will have a cutoff point sooner or later and only make games on newer hardware. What do u mean Halo product, the Halo effect? The Xbone X won't sell as much as the Xbone S nor will one uplift the sale of the other.