Single-channel vs dual-channel RAM for Ryzen: Dual-channel is worth the extra cost now

Running one stick in single-channel mode costs 10-20% gaming performance on Ryzen — don’t starve a budget chip like the Ryzen 3 3100. Finding the exact same stick later is unreliable, and mixing sticks can cause instability or lower speeds. Spending $30–40 more now saves you the hassle of opening the case again.