Memory Tests
AMD makes it nice and easy by implementing DDR4-3200 across the stack, compared with Intel's DDR4-2400 (Core i3-9100F) and DDR4-2666 (everything else) approach.
That said, the way in which Zen 2 is constructed for single CCD processors, or anything eight cores and below, means that write speed is half of what it could be.
Recall how AMD says the 3300X uses a single CCX for lower-latency transfers? There's some evidence here, even if we discount the higher-than-3100 clockspeed.