Overclocking
The ASUS Crosshair VIII Dark Hero showed great headroom for overclocking. I was able to achieve 4.475 GHz at 1.35 V core voltage. The nature of Ryzen 3000 processors has improved some since X570 launched, but I still would not recommend manual CPU overclocks for most applications.
As with my recent B550 reviews, I am also conducting a memory timing test. This is a pass/fail test where I load the DRAM Calculator "fast" preset for my Trident Z Neo kit (Samsung B-die). A board receives a pass if it can run through three loops of MemTest64 with no errors. Partial credit will be given to a board that can get into Windows, but fails MemTest64. As validated by my MSI X570 ACE motherboard, this CPU and memory combination with exactly these sticks can run without errors at these settings.
The ASUS Crosshair VIII Dark Hero was able to reach a respectable 4066 MHz stable at XMP timings and voltages on my Trident Z Neo kit.
For the timings test, the ASUS Crosshair VIII Dark Hero was not able to boot into Windows.