SilverStone RM400 4U Rackmount Server Chassis

The SilverStone RM400 is a 4U rackmount server chassis designed for system builders who need flexible storage expansion and compatibility with standard server components. Supporting SSI-CEB, ATX, Micro-ATX, and Mini-ITX motherboards, it provides a practical platform for business servers, rack-mounted workstations, and storage-focused systems. Unlike the 3U RM31 and RM32, the RM400 features three external 5.25" drive bays alongside internal HDD and SSD mounting positions. Its 4U design accommodates standard-profile expansion cards, while support for PS2 (ATX) or compatible Mini Redundant power supplies gives builders flexibility when selecting power hardware. A lockable front door and sliding rail mounting holes make the RM400 suitable for organised rack installations. Why Choose This SilverStone RM400 4U Rackmount Server Chassis Provides three external 5.25" bays, eight internal 3.5" positions and additional 2.5" mounting options for flexible storage configurations. Supports SSI-CEB, ATX, Micro-ATX and Mini-ITX motherboards, with seven standard-profile PCI/PCIe expansion slots for compatible add-in cards. Includes one front 120mm fan and one rear 80mm fan, with additional 80mm mounting positions for expanded cooling. Features a lockable front door, two USB 3.1 Gen 1 Type-A ports and dedicated mounting holes for compatible sliding rails.