Cooler Master MasterBox NR400
Cooler Master MasterBox NR400
The Cooler Master MasterBox NR400 PC case provides a stable foundation for both office and gaming builds in a compact mATX format. This minimalist design uses optimised airflow through a fine mesh on the front panel to efficiently cool the installed components. The interior offers surprising versatility for fitting graphics cards while retaining an external optical drive bay, which will be appreciated by users who work with physical media. Users can easily install powerful hardware into this case, while the steel chassis with a transparent tempered glass side panel provides a visual check of the internal layout. The case supports efficient airflow thanks to its perforated front and offers plenty of space for graphics cards and taller processor coolers.
Midi Tower
Case size
166mm
Max. CPU cooler height
346mm
Max. graphics card length
2×
Number of installed fans
6×
Number of fan positions
Key features of the Cooler Master MasterBox NR400 PC case
- Supports mATX and mITX format motherboards
- Tempered glass side panel reveals the internal space
- The cooling system can accommodate a total of six fans
- Internal layout offers space for graphics cards
- Case interior enables installation of tall CPU coolers
- The case contains four positions for hard drives
- Front panel features USB 3.2 Gen 1 connectors and audio ports
- Fine mesh on the front acts as a dust filter
Cooler Master MasterBox NR400 design and materials
The chassis combines solid steel elements with durable plastics for the necessary stability and longevity. The tempered glass side panel reveals the internal components and is secured with screws on the back, maintaining a clean look without any distracting elements. The front uses a fine mesh that acts as a dust filter while simultaneously allowing fresh air intake. The design includes an external bay for an optical drive, catering to users who need to work with physical media.
Internal layout and cooling
The interior can accommodate graphics cards up to 346mm long and CPU coolers up to 166mm high. Data storage is handled by a versatile hard drive cage, which can be moved or completely removed according to the current needs of the build. The cooling system relies on two pre-installed fans and supports a total of up to six. The perforated front ensures high airflow to cool heated components. Connectivity is provided by USB 3.2 Gen 1 ports and audio jacks located on the top panel.
Motherboard formats
- mATX (Micro ATX)
- mITX (Mini ITX)
Fans
- Rear fan size: 1×120mm
- Front fan size: 2×120/140mm
Ports
- USB 3.2 Gen 1
- 3.5mm Jack
Specifications
Usage and size
Colour
Internal structure
External structure
PSU
Cooling system
Backlight
Material
Specifications can be changed without notice. Images are for illustrative purposes only.
