Even if both channels are populated, there can also still be additional benefits from bank interleaving - where you have two memory ranks per channel - particul

Even if both channels are populated, there can also still be additional benefits from bank interleaving - where you have two memory ranks per channel - particularly on AMDs Zen architecture family (but Intel as well). Gamers Nexus backed it up with a 27 minute video in late 2020, with plenty of benchmarks to demonstrate that there can be measurable improvement from bank interleaving. https://youtu.be/-UkGu6A-6sQ https://youtu.be/-UkGu6A-6sQ