Ryzen 5 5600X,MSI B550 only 1 RAM slot working

What Is a RAM Slot ? ram slot 1 and 3 or 2 and 4 OVERVIEW · 8+4 Solid Pin CPU Power Connector · Direct 8+2+2 Digital VRM Design 60A Dr MOS · Advanced Thermal Design Fully Covered MOSFET Heatsinks · 3* Ultra rambo slot DIMM slots are numbered sequentially for each processor DIMM slot locations

ramses legacy slot Basic inputoutput system ; Expansion read-only memory ; Security devices; RAM memory Older expansion cards also included memory