I wonder if the board will be a limit to get high Infinity Fabric settings, but then again how high is going to be able to get on a 7nm proces? But 2000MHz or even 2100MHz would be a nice upgrade, also hopeing the 5 ghz rumors is true. Its also going to be interesting to se what flavours of cores we are going to se this time around.
I don't think it's the same N7FF process that Matisse and Renoir was made on. Vermeer is supposed to be on N7+. Problem there is that while EUV has always promised double-digit improvements over N7FF in just about any metric, EUV N7+ doesn't belong to the same lineage as DUV N7FF (Ryzen, Apple A12) and DUV N7P (A13) which could directly port designs over to one another, so we might be in the dark again about what exactly to expect from the silicon and how it'll behave. Renoir already hit 2GHz, and the previously covered extreme overclocking setup with massively overvolted SoC and underclocked cores hit something like 2100, 2133MHz, I think. Yeah, Vermeer isn't monolithic, but I'd be surprised if 1:1 support somehow regressed from Renoir.
What I'm worried about is that while it's great to see practical memory speeds increase again, reaching 4000MT/s may not be quite as easy for the memory as 2933>3200 and 3200>3600. In the past two generational improvements, the limiting factor hasn't been the RAM itself (amongst the "big 3" dies, at least), but we might be running into that wall this time around. Development of better DDR4 dies has basically been stagnant since the appearance of good 8Gb dies from Hynix and Micron; these companies have spent 2019 and 2020 focusing on density with horrible 16Gb dies that would be lucky to reach 3600, scale negatively past 1.35V, and are looser on timings than a bucket of fishing worms.
1.35V for 3600/16, 1.38V for 3733/16, but 1.44V+ for 3800/16 - that doesn't bode well for 4000 on DJR. Unless Hynix pulls some miracle yield improvement out of its ass with DJR or creates a new die altogether, it's starting to look like only Rev.E and B-die are going to be viable for pushing the limits of Zen 3, simply because they can take the voltage safely.