The 5U-sized Silverstone RM51 rack case is designed for industrial rack installations or high-end home systems, and it can be positioned either vertically or horizontally.

The case comes with two pre-installed Air Penetrator 184i PRO fans, ensuring excellent cooling performance. It is downward compatible with 3 x 120 mm fans, allowing for triple 120 mm or dual 180 mm liquid cooling radiators.

The internal 3.5″ drive cage supports installation of 2 x 3.5″ HDDs. If left empty, it allows for a secondary power supply in SFX form factor. To prevent unexpected damage to the motherboard or graphics card, it includes an expansion card bracket with mounting holes for storage drives that prevent GPU sag and maximize space usage.

Technical specifications:

• Model: Silverstone RM51
• Size: 5U
• Material: Steel
• Compatibility: SSI-EEB, SSI-CEB, Extended ATX, ATX, Micro-ATX, Mini-ITX
• Drive bays: 3.5″ x 2 (compatible with 2.5″ x 3) + 3.5″ x 2 (compatible with SFX PSU), 2.5″ x 4
• Expansion slots: 8 PCI expansion slots
• Expansion card: Length: 455 mm (without front fan and radiators installed), Width with expansion card bracket: 157 mm, Width without expansion card bracket: 198 mm
• Cooling system: Front: 120 mm x 3 / 180 mm x 2 (2 x Air Penetrator 184i PRO fans included), Rear I/O: 120 mm x 1 / 140 mm x 1, Rear fan housing: 80 mm x 2
• Radiator support: Front: 120 mm x 3 / 120 mm x 1 + 240 mm x 1 / 360 mm x 1 (120 mm x 3) / 360 mm x 1 (180 mm x 2); Rear: 120 mm x 1
• Power supply: Primary PSU slot: PS2 (ATX) / Mini Redundant, Secondary PSU slot: SFX (reserves 3.5″ cage)
• Power supply length: 160–190 mm (removing the 3.5″ drive cage removes the PSU depth limitation)
• CPU cooler height with expansion card bracket: 181 mm, height without expansion card bracket: 192 mm
• Connections: 2 x USB 3.0, 1 x USB Type-C
• LED indicators: Power status x 1, HDD activity x 1, LAN activity x 2
• Other: Side switch, mountable in vertical or horizontal position, includes mounting holes for sliding rails for quick rail installation
• Dimensions: Including rear fan bracket: 440 mm (L) x 220 mm (H) x 530 mm (W), 51.3 liters; without rear fan bracket: 440 mm (L) x 220 mm (H) x 485 mm (W), 46.95 liters
• Net weight: 10.6 kg