That is better 2 dual rank dimm's or 4 single rank. - CPUs, Motherboards, and Memory - Linus Tech Tips
DDR4 rank for Ryzen, help me understand | AnandTech Forums: Technology, Hardware, Software, and Deals
Performance increase for gamers: Memory with single-rank, dual-rank and quad -rank explained and compared | Practice with benchmarks | Page 3 | igor'sLAB