External: 8x USB 3.1 (4x Front, 4x Rear) | Combo Audio (Front) | Serial Port (Rear) | PS/2 Mouse and Keyboard (Rear) | Audio Line-In / Audio Line-Out (Rear)
internal: 3x PCIe 3.0 x4 | 5x PCIe 3.0 x16 (2nd CPU required) | Up to 9x M. 2 SSD: 2x via onboard slots, 4x via Quad M. 2 to PCIe adapter, 3x via Single M. 2 to PCIe adapter 2x 3.5″ disk bay (standard)