I would regard this latest bit of news about the ap and coming AMD Zen 2/Ryzen 3rd Generation processors with a high level of uncertainty but hopefully it is true.
AMD had an impressive demo for its Ryzen 3rd Generation with their latest chip competing with the Intel i9-9900K while consuming around 30% less power with the same number of active cores and threads. Then there is the fact that the Zen 2 chips will go beyond 8 cores, extending to 12 and 16.
A YouTuber called DannyzPlay has now claimed that the engineering sample used during the demo was actually intentionally power restricted by 30-40% meaning that the 133.4w achieved could have gone up to over 170w making it run at around the same power as the Intel i9-9900K.
If true, this means the engineering sample used should have comfortably outperformed the i9-9900K by a significant margin as the increased power will have a direct effect on clocks/power. Admittedly this is unlikely to be an increase of 30/40% in performance, but it would have certainly beaten the i9-9900K by a significant margin.
One reason for AMD doing this could be that performance doesn’t increase linearly compared to power, so running the chip at the same performance level as the i9-9900K meant they could boast about 30% power savings. Whereas running it at full throttle might have meant 10-20% performance gains.
AMD was also reported as saying that B450, X370 and X470 will support AMD's Ryzen 3rd Generation processors, with lower-end B350 processors being left behind. While AMD has claimed that AM4 will support new Ryzen processors until 2020, the company never specified which chipsets this applied to, so skipping Ryzen 3rd Gen BIOS updates for B350 isn't exactly out of the question.
If true, this will likely irk some Ryzen users as they were initially promised compatibility with newer Ryzen processors.
It is entirely possible that the B350 will technically be able to support the new chips and it will be up to the discretion of motherboard manufacturers to offer an updated bios allowing compatibility. One like scenario is that the older B350 won’t be physically compatible with the top of the range chips due to power draw requirements.
DannyzPlay also claims that that Ryzen 3rd Generation processors will also boast increased memory compatibility, which is great news for AMD as the current chips struggle to get past 3200MHz.