I've modified the subject of topic and I'll post the results with KeyShot10 soon later.
And I'll keep the old post below just for the records.
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I've just tested AMD EPYC 64cores Engineering Sample CPU '100-000000053-04', got at eBay.
Motherboard: Supermicro H11DSi-NT Rev. 1.01 (with self-modified R2.1 BIOS for Zen2 Rome)
CPU: Dual AMD Eng Sample 100-000000053-04, boosted ~2.7GHz(SMT-on), ~3.0GHz(SMT-off), 64 Core
RAM: DDR4-2666 2R(Dual Rank) 8GB x16
GPU: Quadro RTX 4000
Camera Benchmark: ~720FPS(SMT-on) ~998FPS(SMT-off) [UPDATE: I've replaced the sceenshots with the one by KeyShot 9.3.14]
CAUTION: H11DSi-NT(=dual CPU motherboard) with single '100-000000053-04' could not boot up, In my experience.
Motherboard: Supermicro H11SSL-i Rev. 2.0
CPU: Single AMD 64cores Eng Sample 100-000000053-04, boosted ~2.7GHz(SMT-on)
RAM: DDR4-3200 2R(Dual Rank) 16GB x8
GPU: GeForce GT710
Camera Benchmark: ~740FPS
I had expected that dual ES '100-000000053-04' would exceed 1000FPS easily, but no.
Disabling SMT(Simultaneous Multithreading) is a workaround, but it affects V-ray bench and CINEBENCH negatively.
So, KeyShot may have some issue about thread control over 128 threads...
[UPDATE: KeyShot 9.3.14 realtime mode may still have issue, but now it seems that KeyShot Vierwer 9.3.14 can handle 256 threads properly... I'll post about it later.]