MSI MAG B550 TOMAHAWK ATX MB 4xDDR4 up to 128GB 1xPCIe 4.0/ 3.0 x16 slot 6xSATA 6Gb/s ports 2xM.2 slotsMSI MAG B550 TOMAHAWK ATX MB MSI MAG B550 TOMAHAWK ATX MB 4xDDR4 up to 128GB 1xPCIe 4. 0 3. 0 x16 slot 6xSATA 6Gb s ports 2xM. 2 slots AMD B550 SAM4 ATX DDR4 5000 4866 4800 4733 4600 4533 4400 4266 4133 4000 3866 3733 3600 3466 3200 3066 3000 2933 2800 2666 2400 2133 1866 MHz Memory slots 4 2xPCI Express 3. 0 1x 1xPCI Express 3. 0 16x 1xPCI Express 4. 0 16x 2xM. 2 1xHDMI 1xDisplayPort 2xUSB 2. 0 3xUSB 3. 2 1xUSB C 1xPS 2 1xOptical S PDIF 2xRJ45