Regarding overclock on Threadrippers, I liked this video
Very much not worth it, you add between 100 to 300W for very negligible multithreaded increase and inversely decrease in single-core performance.
This guy also had super ideal setup, room ambient 21C, and open-air case and fans spinning at 1400RPM on Alpha Zenith II which has tiny VRM fans that were spinning. With setup this good, the temps were high ( 70 +/- C) but very good for the stock boost of almost
3.85 GHz (!) all-core, but overclocked up to 90C. Once again, in super ideal setup, add 3-4 for realistic room ambient, and another for Case. The limit for shut-down is 95 it looks.
Imho this is good news, there wasn't any point to overclock with previous gen, but it's fully pointless with 3xxx. The CPU is perfectly binned, comes soldered and has great heatspreader. (all 3 are exact opposite of my i9 build haha, which benefits massively from overclock to detriment of terrible temperatures even after delidding).
I have such a strong urge to build 3970X, but I'll wait for the January info. On other hand, I received all parts for 3950X build today, and I will be building it in next few days.