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 5300+ (Max. 5800)/ 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 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 5300 MHz (QVL), Max. 5800 MHz 1DPC 2R max speed 4266 MHz (QVL), Max. 4600 MHz 3rd Gen AMD Ryzen processors: 1DPC 1R max speed 5100 MHz (QVL), Max. 5300 MHz 1DPC 2R max speed 4260 MHz (QVL)