AMD B550 Supports AM4 socket 3rd Gen AMD Ryzen processors, and future AMD Ryzen processors with BIOS update Supports DDR4 4400+/ 4266/ 4133/ 4000/ 3866/ 3733/ 3600/ 3466/ 3200/ 3066/ 3000/ 2933/ 2800/ 2667 MHz by A-XMP OC MODE Supports DDR4 3200/ 3066/ 3000/ 2933/ 2800/ 2667/ 2400/ 2133/ 1866 MHz by JEDEC 1DPC 1R max speed 4400 MHz 1DPC 2R max speed 3866 MHz 2DPC 1R max speed 4000 MHz 2DPC 2R max speed 3600 MHz