NetStor NA255A-XGPU External Desktop 4-Slot PCI-Express 3.0 Expansion Chassis Extremely High-Speed 128Gbps PCIe 3.0 x16 host connectivity Solid metal structure with stylish aluminum housing Dedicated single 1000 watts power supply for GPU usage Two quiet front 120x120x25 mm fan cooling for self-contained ventilation Capable of up to four dual-slot GPU cards