Should I choose dual-rank or single-rank RAM for my Ryzen system?

Dual-rank RAM is faster than single-rank on Ryzen systems, with a real 5–10% performance gain in memory-sensitive tasks, but you won’t notice it in everyday use unless you’re doing heavy number crunching. If you’re building a high-end Ryzen rig and the price difference is small, go dual-rank. If you’re on a budget, single-rank is fine — you won’t notice the difference opening Chrome tabs.