AMD B550 Supports AMD Ryzen 5000 & 3000 Series desktop processors (not compatible with AMD Ryzen 5 3400G & Ryzen 3 3200G) and AMD Ryzen 4000 G-Series desktop processors AMD Ryzen 4000 G-Series processors support DDR4 5100+ (Max. 5600)/ 5000/ 4866/ 4800/ 4733/ 4600/ 4533/ 4400/ 4266/ 4133/ 4000/ 3866/ 3733/ 3600/ 3466/ 3200/ 3066/ 3000/ 2933/ 2800/ 2667 MHz by A-XMP OC MODE 3rd Gen AMD Ryzen processors supports DDR4 5100+/ 5000/ 4866/ 4800/ 4733/ 4600/ 4533/ 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 AMD Ryzen 4000 G-Series processors: 1DPC 1R max speed 5100 MHz (QVL), Max. 5600 MHz 1DPC 2R max speed 4266 MHz 2DPC 1R max speed 4400 MHz 2DPC 2R max speed 3600 MHz 3rd Gen AMD Ryzen processors: 1DPC 1R max speed 5100 MHz 1DPC 2R max speed 4000 MHz 2DPC 1R max speed 4000 MHz 2DPC 2R max speed 3600 MHz