ASROCK B550 Pro4 ATX MB 3rd Gen AMD AM4 Socket DDR4 4733+ 1 x3.0 x16 x4.0 PCIe HDMI D-Sub 7.1 CH HD 6 SATA3 1 M.2 2 USB 3.2 Gen2ASROCK B550 Pro4 AM4 DDR4 ATX MB ASROCK B550 Pro4 ATX MB 3rd Gen AMD AM4 Socket DDR4 4733+ 1 x3. 0 x16 x4. 0 PCIe HDMI D Sub 7. 1 CH HD 6 SATA3 1 M. 2 2 USB 3. 2 Gen2 AMD B550 SAM4 ATX DDR4 4733 4666 4600 4533 4466 4400 4333 4266 4200 4133 4000 3866 3800 3733 3600 3466 3200 2933 2666 2400 2133 MHz Memory slots 4 2xPCI Express 3. 0 1x 1xPCI Express 3. 0 16x 1xPCI Express 4. 0 16x 2xM. 2 1x15pin D sub 1xHDMI 5xUSB 3. 2 1xUSB C 1xPS 2 1xRJ45 3xAudio port