Learn more aboutGIGABYTE B550M K. AMD Ryzen 5000 Series/3000 Series Processors support PCIe 4.0 x16 mode. AMD Ryzen 5000 G-Series/4000 G-Series Processors support PCIe 3.0 x16 mode. AMD Ryzen 5000 Series/3000 Series Processors support SATA and PCIe 4.0 x4/x2 SSDs.