Overclocking

The Ryzen line has never been great for clock headroom, and the 2920X is no exception. I was able to get the 2920X stable with an all-core boost of 4.35 GHz at 1.4 V set in BIOS. Overclocking manually is very easy on the ASRock X399 Phantom Gaming 6—simply set the "CPU Frequency and Voltage Change" to manual and input the desired frequency. It is a simple system, but honestly, I wouldn't take advantage of it for 24/7 use. These Threadripper chips are big and produce a ton of heat. At this speed, my chip was creeping into the 90 °C range pretty quickly in my power consumption tests. The Alphacool Eisbaer is a great AIO, but there is only so much heat a 240 mm radiator can dissipate.

The ASRock X399 Phantom Gaming 6 proved to have surprisingly solid memory stability. ASRock typically has above average boards for memory clocking, but the AMD platforms struggle in this area. The ASRock X399 Phantom Gaming 6 wasn't able to boot with the 3866 MHz XMP setting on my T-Force sticks, and I didn't expect it too. These sticks are a bit beyond what I would consider reasonable for a current-generation AMD board.

That said, I got all four sticks stable at 3600 MHz, which is really good, far above my expectations. I am very glad that despite the limited capabilities of the Ryzen memory controllers, ASRock is still committed to providing stellar memory stability.