Something to note about the Threadripper Pro CPUs in the previous generations that may apply here: The 12 and 16 core variants only had the ability to saturate

Something to note about the Threadripper Pro CPUs in the previous generations that may apply here: The 12 and 16 core variants only had the ability to saturate the IO die with enough data to fully utilize 4 channels of RAM due to fewer CCDs being populated. I would bet that will be the case here as well. So those bottom CPUs will be just the budget IO monsters, and be no better than the non-Pro (for RAM bandwidth) even in the Pro boards. The one caveat is that they probably won’t have the speed penalty with 8 RDIMMs that the others probably will.