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Black mini-tower server chassis with side window, two 5.25-inch external bays, four 3.5-inch internal bays, front USB 3.0 ports

Supermicro

Supermicro CSE-731I-404B Mini-Tower Server Chassis 400W

SKU CH-ES8H-F9QTE MPN CSE-731I-404B

Mini-tower server chassis holds two 5.25" external and four 3.5" internal drive bays with a 400 W Gold power supply included

  • Power supply included400 W
  • Supported motherboard sizesMicro ATX
  • Side panel typeWith Side Window
  • 5.25-inch external bays2
  • 3.5-inch internal bays4
  • Expansion card slots4
  • Rotatable 90° drive cage simplifies drive installation
  • Whisper-quiet operation under 25 dB keeps noise low
  • Two front USB 3.0 ports give fast peripheral access
  • 400 W Gold-certified PSU delivers efficient power
  • Four internal 3.5" bays plus two external 5.25" bays offer flexible storage

Mini-Tower Server Chassis

The Supermicro CSE-731I-404B is a black mini-tower server chassis built for Micro-ATX motherboards up to 9.6 x 9.6 inches. It ships with a 400W Gold-certified power supply and a side window panel. The compact frame measures 140 x 150 x 86 mm. It suits small-footprint server builds or quiet workstations.

Drive Bay Configuration

This chassis provides two external 5.25-inch drive bays and four internal 3.5-inch drive bays on a 90-degree rotatable cage. That cage layout is the single specification that determines whether your storage plan fits. Builds needing more than four 3.5-inch drives or any 2.5-inch-only mounts cannot use this case.

Installation Notes

The rear 9 cm PWM fan runs at 2050 RPM and an optional front 8 cm PWM fan at 2800 RPM can be added for intake. Whisper-quiet operation is rated below 25 dB. Front I/O includes two USB 3.0 ports. A Kensington lock slot is provided. Verify Micro-ATX board clearance and PSU cable routing before assembly.

How it compares

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

Price $153.99
Cheaper than about 75% of the 1,006 comparable items (median $222.49).

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Specifications

Product
Brand nameSUPERMICRO
Part numberCSE-731I-404B
Product typeMini-Tower Chassis
Product colorBlack
Storage
5.25-inch external bays2
3.5-inch internal bays4
Ports & slots
Expansion card slots4
Front panel ports2 x USB 3.0
Power
Power supply included400 W
Size & build
Side panel typeWith Side Window
Fan mounting options1x 9 cm (2,050 RPM) rear exhaust fan(s)
Optional 1x 8 cm (front) cooling fan
Product dimensions140 × 150 × 86 mm
Shipping weight18.14 kg
Package size531 × 427 × 178 mm
Compatibility
Supported motherboard sizesMicro ATX
PSU length limit400 W ATX/PS2 Multi-output Power Supply

Questions about this item

How does the 400W power supply hold up under continuous server loads?

The 400W unit is Gold certified for high efficiency and powers the included 9 cm rear fan running at 2050 RPM plus an optional 8 cm front fan at 2800 RPM.

What does the Micro-ATX motherboard limit mean for expansion cards?

The chassis provides four expansion slots and fits Micro-ATX boards up to 9.6 by 9.6 inches, so full-height cards are supported within that slot count.

Will the 90-degree rotatable drive cage fit in my rack shelf?

The mini-tower measures 140 mm wide, 150 mm deep and 86 mm high, with four internal 3.5-inch bays and two external 5.25-inch bays accessible from the front.

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