System Form Factor - 1U Rackmount Chassis Model - 1U4LW Support MB - X470D4U(mATX, 9.6 x 9.6) Front Panel Buttons - Power Switch, ID Switch, System reset, NMI LEDs - Power status, HDD,LANs, System Fail activity LEDs I/O Ports - 2 x USB 3.0 ports External Drive Bay Front Side Drive Bay -External : Hot-swap 3.5 HDD x 4 or 2.5 HDD x4 . Slim ODD x1 or 2.5 HDDx 1 (optional) -Internal: 2.5 HDD x 2 Internal Side - 2(M2_1: 2242/2260/2280/22110, PCIE(X4) M2_2:2242/2260/2280/22110, SATA/PCIE(X2)) Power Supply Type - Single PSU Output Watts - 400W System Fan Fan - 40 x 28 mm PWM Easy-Swap Fans x 5 Processor System CPU - AMD AM4 Socket RyzenTM PRO/ RyzenTM 2nd and 3rd generation series processors Socket - AM4 PGA 1331 Chipset - AMD Promontory X470