Asus ROG Strix B550-A Gaming AM4 ATX Motherboard - Manual (Page 17)

ROG STRIX B550-A GAMING 1-5
Chapter 1
2. DIMM slots
The motherboard comes with Dual Inline Memory Modules (DIMM) slots designed for DDR4
(Double Data Rate 4) memory modules.
A DDR4 memory module is notched differently from a DDR, DDR2, or DDR3 module. DO
NOT install a DDR, DDR2, or DDR3 memory module to the DDR4 slot.
DIMM_B1 DIMM_B2* DIMM_A1 DIMM_A2*
Recommended memory configurations