Performance issues with AMD Ryzen Threadripper 3970X and 3990X

Problem

We have received reports of performance issues with the AMD Ryzen Threadripper 3970X and 3990X processors featuring 32/64 cores (64/128 threads). The system behaves as if Cubase/Nuendo is processing on a single core only and the performance is far from what could be expected under normal conditions.

Tests with 1st generation AMD Ryzen Threadripper using 16 cores do not show this behavior.

Cause

Both processor models use a different architecture and are basically completely different CPUs compared to the older models. We could verify the incompatibility a few days ago using a customer's system trace.

Solution

We have ordered the latest models to run extensive tests, and we are in contact with AMD to address the issue as soon as possible. Unfortunately, we cannot recommend using these two processor models with our software until further notice.