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Silverstone SST-RM400 4U rackmount server chassis, silver front panel with door and handle, rear expansion slots

Silverstone

Silverstone SST-RM400 server chassis

SKU CH-108K-CJR74 MPN SST-RM400

A 4U rack-mount server chassis holding eight 3.5" drives, three 5.25" bays, two 2.5" slots and seven full-height expansion cards, with front USB 3.1 Gen1 ports.

  • Max graphics card lengthCompatible up to 8.6 in (220 mm) in length, width restrictio
  • Housing materialSGCC
  • Power supplyPS2 / ATX / Mini Redundant (supports up to 160 mm)
  • Power supply mountingRear
  • Supported motherboard sizesCEB / Micro ATX / ATX / Mini-ITX
  • 5.25-inch external bays3
  • Supports SSI-CEB, ATX and Micro-ATX motherboards for flexible server builds
  • Eight 3.5-inch drive bays provide high-density storage capacity
  • Seven full-height expansion slots accommodate standard PCIe add-in cards
  • Front USB 3.1 Gen1 ports deliver 5Gbps data access
  • Lockable front door and intrusion switch enhance physical security

SilverStone RM400 4U server chassis

The SilverStone RM400 is a 4U rack-mount chassis built for SSI-CEB, ATX, Micro-ATX and Mini-ITX motherboards. It provides eight 3.5-inch internal drive bays, two 2.5-inch bays and three external 5.25-inch bays for high-density storage. Seven full-height expansion slots support standard-profile add-in cards. A lockable front door secures drive access in shared environments.

Tool-free drive trays

The chassis ships with one 120mm front fan and one 80mm rear fan; an additional 80mm front fan or a 120mm alternative can be fitted. Drive cages use tool-free trays for quick 3.5-inch and 2.5-inch installation. The front door hinge allows full opening for component access. Cable routing space behind the motherboard tray is limited, so plan power and data runs before securing drives.

Verify power supply depth

The rear-mounted PSU bay accepts ATX, PS2 or mini-redundant units up to 160mm deep. CPU coolers must not exceed 130mm in height. Graphics cards up to 220mm long fit with drives installed; removing the 3.5-inch cage extends support to 339mm length, though card width remains limited to 106mm. Rail slides for rack mounting are sold separately.

How it compares

Measured against everything we stock in Rackmount Server Cases, at today’s prices. Recalculated every night.

Price $187.99
Cheaper than about 62% of the 1,006 comparable items (median $222.49).

New to this? Buying PC parts with Monero — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameSilverStone
Model nameSST-RM400
Storage
5.25-inch external bays3
3.5-inch internal bays8
2.5-inch internal bays2 × 2.5 in (up to 15 mm)
1 × 2.5 in (up to 15 mm) or slim optical (12.7 mm)
Ports & slots
Expansion card slotsStandard profile PCI / PCIe x 7
Front panel ports2 x USB 3.1 Gen1 Type-A
Power
Power supply includedNo
Power supplyPS2 / ATX / Mini Redundant (supports up to 160 mm)
Size & build
Housing materialSGCC
Power supply mountingRear
Fan mounting optionsFront: 1 × 80 mm fan or 1 × 120 mm fan (1 × 120 mm fan included)
Rear: 2 × 80 mm fan (one fan included)
Product dimensions6.93 in × 16.93 in × 17.56 in
Product weight23.81 lb (10.8 kg)
Shipping weight14.97 kg
Package size610 × 559 × 330 mm
Compatibility
Supported motherboard sizesCEB / Micro ATX / ATX / Mini-ITX
CPU cooler height limit130 mm

Questions about this item

How do I confirm the front-panel USB ports are running at 5 Gbps after connecting the case to my motherboard?

Connect the front-panel header to a USB 3.1 Gen1 header on the motherboard, then verify in the OS that attached devices enumerate at 5 Gbps using Device Manager or lsusb.

The chassis ships without a power supply; which form-factor PSUs fit the rear mount and what is the maximum depth?

The rear mount accepts PS2, ATX or mini-redundant units up to 160 mm deep; no power supply is included in the box.

I need to install a full-height graphics card — which GPU length limit applies when all eight 3.5" drive bays are populated?

With the 3.5" drive cage installed the maximum supported card length is 220 mm (8.6") and the width must not exceed 106 mm (4.2").

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