Model No. SST-RM41-H08 Chassis form factor 4U Material SGCC Motherboard SSI-CEB (12" x 10.5"), ATX (12" x 9.6"), Micro ATX (9.6" x 9.6"), Mini-ITX (6.7" x 6.7") Drive Bay External 5.25" x 3 3.5" x 5 (Hot-swappable) Internal 3.5" x 4 2.5" x 2 (Support up to 15mm) 2.5" x 1 (Support up to 15mm) or slim optical drive (Support up to 12.7mm) Power Supply PS2 / ATX / Mini Redundant (supports up to 200mm) Expansion card Compatible up to 7.87” (200mm) long Limitation of CPU cooler 148mm Expansion Slot 7 standard PCI / PCIe expansion slots Front I/O Port USB 3.1 Gen1 Type-A x 2 Front buttons Power On / Off, restart Indicators Power status x 1, system reset x 1, network status x 2 Main metal thickness 1.2mm Net Weight 10.7 kg Dimension 430mm (W) x 176mm (H) x 446mm (D) 16.93" (W) x 6.93" (H) x 17.56" (D)