Where to Put 1 RAM Stick in 4 Slots Motherboard
For single RAM stick in 4-slot boards, optimal placement boosts performance in 2026 systems. This list covers standards and tweaks.
Standard Recommendation: Slot A2
Use second slot from CPU (A2/B2 dual-channel prep). Dual-rank preferred.
Why Not Slot A1?
A1 single-channel throttles speed 10-20%. Reserve for future pairs.
Intel vs AMD Boards
Intel Z790: A2 always. AMD X870: DIMM2 (outer from CPU).
Performance Impact Tests 2026
A2 vs A1: +15% bandwidth in Cinebench.
If Overclocking
Test A1 for stability, but A2 voltage better.
Visual Slot Guide
A1 A2 | B1 B2 — Pick A2.
Troubleshooting No Boot
Reseat, check QVL list.
Future-Proofing
Leave A1/B1 free for matching sticks.