All core clock of 3.5 GHz with a boost frequency of 4.7 GHz. 105W TDP. It will be interesting to see how latency is affected for core-core communication with multiple chiplets. Both the R9 models sport multiple chiplets.
With the dedicated I/O chiplet in this generation as well as reduced L1 cache we know latency is going to be both consistent and higher than Zen and Zen+ from Lisa Su's speech at E3, so that combined with the new Windows 10 scheduler should eliminate those cross CCX issues Zen suffers with.
But with 16 cores, no doubt there will be issues like there are with high core count Threadrippers in some programs...
The Ryzen 9 3900X certainly seems to be the sweet spot in price/performance. For $100 over the R7 3800X, you get 4 additional cores ($25 per core). The next 4 core jump to the R9 3950X costs $250 ($62.50 per core). Jumping from a Ryzen 5 3600X to a 3700X costs $80 (or $40 per core).
That I would agree with, plus finding a program that would make use of an extra 4 cores and justify the extra $250 expense on a platform with only a dual channel memory controller would be an issue, not to mention the overall lower operating frequency as the 3800X-3950X share the same 105w TDP.
So it sounds like the jump in price for those last four cores is due in part, due to special binning on the R9 3950X.
The R9 3950X is intended not only to have the highest core count, but also the highest single threaded performer. AMD wants to ensure that both creative and gaming performance increase as you move up the product stack.
I think the implication is that the parts with the most cores, will also have the highest single core boost clocks. Unlike Intel where the higher core parts typically clocked lower than the mainstream parts, making the mainstream parts better for gaming.
So if you buy a R9 3950X it will be the fastest AM4 part in productivity and content creation (more cores) but also in gaming (highest boost clock).
So...It's September. Maybe they are waiting for the UEFI boost clock fix to drop the 3950X so it hits 4.7GHz for reviewers.
Or TSMC is having a huge yield problem and AMD is devoting as much as possible to the EPYC server line as they command much, much higher prices.
Looks like September 30th may be the day. About the time that the 220.127.116.11ABBA UEFI releases should be available for reviewers.