Cooler Master MasterBox MB400L Micro-ATX Mini Tower, Steel, Solid Side Panel, No PSU

The Cooler Master MasterBox MB400L is a compact Micro-ATX Mini Tower case designed for efficient builds with a focus on clean aesthetics and solid performance. Featuring a steel construction and a solid side panel, this case offers durability and a minimalist look. It supports Micro-ATX and Mini-ITX motherboards, providing flexibility for various system configurations.

Advantages

Compact size with excellent internal space utilization, supporting up to 344mm GPU and 163mm CPU cooler. Tool-free drive installation and removable dust filters simplify maintenance. The solid steel side panel ensures noise dampening and a sleek appearance.

Suitable for

• Home and office PCs requiring a compact yet expandable chassis
• Gaming builds with high-end components within size limits
• Media center or HTPC setups

Key specifications

• Case Type: Micro-ATX Mini Tower
• Motherboard Support: Micro-ATX, Mini-ITX
• Materials: Steel, Plastic
• Side Panel: Solid Steel
• Expansion Slots: 4
• 3.5" Drive Bays: 2 (Max)
• 2.5" Drive Bays: 4 (2 dedicated, 2 shared with 3.5" bays)
• I/O Ports: 2x USB 3.2 Gen 1 Type-A, 1x 3.5mm Headset Jack
• Pre-installed Fans: Rear: 1x 120mm
• Fan Support: Front: 2x 120mm / 2x 140mm; Top: 1x 120mm / 1x 140mm; Rear: 1x 120mm
• Radiator Support: Front: 120mm, 140mm, 240mm, 280mm; Top: 120mm, 140mm; Rear: 120mm
• Max CPU Cooler Height: 163 mm
• Max GPU Length: 344 mm
• Max PSU Length: 140 mm (with HDD cage), 325 mm (without HDD cage)
• Power Supply Type: ATX PS2 (not included)
• Dust Filters: Top, Front, Bottom

Recommendations

Ideal for users seeking a compact, no-frills case with good airflow and component support. Pair with a modular PSU for easier cable management.