Hello again,
Srr if I am reviving a "dead topic", but after 4 months I have more data to share.
4 months ago, I thought the problem was with my "exotic CPUs", because they are the OEM version (e5-2696v4). I thought that was the problem... So I decided to buy 2 original e5-2699v4 and change them... And surprise... I have the same problem :/
I found a post on the official Autodesk forum (they're old, but I'm pretty sure they haven't fixed it yet) that said 3dsmax can NOT properly handle +64 threats.
In addition, Windows 10 also has some problems with +64 threats... for example, I cannot "set affinity" in task manager and manage the number of threats for a certain application (Windows denies this action if it has more than 64 threats) And TR 3990x is known to have issues with its performance:
https://www.anandtech.com/show/15483/amd-threadripper-3990x-review/3
And on top of this, corona is NOT working properly too. There are maps that SINK render performance when I use them (like triplanarTex) or native 3dsmax output or bitmap (and I think there will be more maps for sure).
I'm using corona 6/7 and I don't know if in corona 8 any of this is fixed or at least in a "fix schedule". I know you can not fix 3dsmax maps, but at least, try to fix your own maps like tryplanarTex, and check the others.
I'm still shocked that it took me like a whole year to know what was going on here. Finding almost 0 information on this. And I can not believe nobody is complaining of this.
There is any alternative? Can I render in other OS? do you have Linux render node soft?