Compared with the Ryzen 3000 series Threadrippers, the "Chagall" based parts are expected to feature higher clockspeeds. There will be no increase in core counts. It's still a bit of a mystery whether Chagall is based on Zen 3 or Zen 3+.
The TR 5000 series will not feature a higher core count than the existing 3000 series but will likely see an increased frequency over the “Castle Peak” series based on Zen2 architecture. The arrival of Chagall next year might suggest AMD will be using Zen3+ microarchitecture instead of Zen3. The former is expected to debut with the APU series Ryzen 5000 codenamed “Rembrandt” and possibly with Ryzen 5000XT SKUs at CES 2021.
Chagall seems to be delayed again, probably next year.— Greymon55 (@greymon55) October 1, 2021