SilverStone RM31 3U Rackmount Server Chassis

SilverStone RM31 is a 3U rackmount server chassis designed for workstation and server builds requiring flexible motherboard, cooling, and power supply configurations. It supports SSI-EEB through Mini-ITX motherboards, eight expansion slots, front 360mm radiator mounting, and up to four internal drive positions.

Who It Suits

• Server and workstation builders needing SSI-EEB, SSI-CEB, E-ATX, ATX, Micro-ATX or Mini-ITX motherboard support and eight expansion slots.
• Liquid-cooled rackmount systems requiring front 120mm, 240mm or 360mm radiator mounting and flexible cooling configurations.
• System integrators needing primary SFX/SFX-L or compatible 2U CRPS redundant power supplies, with an optional secondary SFX/SFX-L position.

Not suitable for high-density NAS systems requiring numerous hot-swap drive bays or installations with insufficient rack depth.

Before You Buy

• Verify motherboard dimensions and rack clearance. The chassis measures 438 × 132 × 488mm and supports CPU coolers up to 110mm tall.
• Primary PSU options include SFX/SFX-L or compatible 2U CRPS redundant units. Removing the 3.5" drive cage eliminates the specified primary PSU depth restriction.
• Installing a secondary SFX/SFX-L PSU requires removing the 3.5" drive cage. Expansion-card clearance is up to 458mm long without front fans or radiators, and 115mm wide.

Model
SST-RM31

Chassis Form Factor
3U rackmount

Material
Steel

Motherboard Support
SSI-EEB, SSI-CEB, Extended ATX, ATX, Micro-ATX, Mini-ITX

Drive Support - Internal
3.5"X2 or 2.5"X2, 2.5"X2

Cooling - Front
3 x 120mm fan mounting positions

Cooling - Rear
2 x 60mm fan mounting positions

Radiator Support
Front: 120mm / 240mm / 360mm

CPU Cooler Clearance
110mm maximum height

Expansion Slots
8 x slots

Expansion Card Limitation
Maximum length: 458mm (without front fans or radiators)
Maximum width: 115mm

Power Supply - Primary Slot
SFX/SFX-L or 2U CRPS Redundant

Power Supply - Secondary Slot
SFX/SFX-L (Removal of 3.5" drive cage)

PSU Depth - Primary
250mm (Removal of 3.5" drive cage eliminates PSU depth limitation)

PSU Depth - Secondary
140mm

PSU Cable Requirements (SFX)
CPU 4+4-pin at least 700mm, ATX 24/20-pin at least 450mm

PSU Cable Requirements (CRPS)
CPU 4+4-pin at least 700mm, ATX 24/20-pin at least 500mm

Front I/O
1 x USB Type-C, 2 x USB 3.0

LED Indicators
Power status (blue), HDD activity (white), LAN activity x 2 (green)

Dimensions
438mm (W) x 132mm (H) x 488mm (D)

Volume
28.21 litres

1 YEAR WARRANTY

Avertek Enterprises Pte Ltd
25 Kallang Ave #03-03, Singapore 339416
Contact: 6341 7839

How long will it take to receive my purchase?

Standard Shipping - 3 to 5 days
Express Shipping - 1 to 2 days

Can I opt for store pickup?

Yes, we are open daily for collection from 11 AM - 6.30 PM.
Address: 1 Ubi View #01-22, Focus One Building Singapore 408555 (Door located nearest to carpark exit gantry) We will contact you once your order is ready for collection!

What is the difference between RM31 and RM31-MINI?

The RM31 is 488mm deep, compared with 391mm for the RM31-MINI. Both support SSI-CEB, E-ATX, ATX, Micro-ATX, and Mini-ITX motherboards, but the RM31 additionally supports SSI-EEB. The RM31 also provides an additional 2.5" drive position, longer expansion card clearance, and support for compatible 2U CRPS redundant power supplies. Choose the RM31 for larger server hardware and more flexible PSU configurations, or the RM31-MINI when shorter chassis depth is a priority.

Can I use two PSUs for redundancy?

The RM31 supports compatible 2U CRPS redundant power supplies in its primary PSU position. It also has a secondary SFX/SFX-L PSU position that becomes available when the 3.5" drive cage is removed. Installing two independent PSUs does not automatically provide power redundancy; this requires compatible power distribution and failover hardware.

What happens if I remove the 3.5" drive cage?

Removing the 3.5" drive cage eliminates the manufacturer's specified 250mm primary PSU depth restriction and makes room for a secondary SFX/SFX-L power supply. Physical clearance must still be verified, and removing the cage reduces the available drive mounting options.