How fast are those fan running? What size?Optimizing Threadripper is entirely about cooling. I have a 3990x in a 4u enclosure and I use an Enermax AIO with 3x Noctua industrial fans. Yeah, it's loud, but it's cold. I can sustain all core boosts of 4.1ghz with PBO enabled under 100% CPU usage. Enabling PBO increased performance exactly 25% on cinebench.