A Closer Look - Inside

To gain access to the Masterbox NR400, simply remove the thumb screws holding each panel in place. The interior is all black and there are fairly compact, slightly angled grommets for you to route your cables through. Cooler Master has included plenty of zip tie hooks for easy and clean cable management. There are two 2.5" hard-drive mounting location here for drives you don't want to show off.


On top of that, the shroud allows for two more 2.5" drives, which can then easily be seen when looking at the internals through the windowed side.


Last but not least, there are two additional 3.5" hard-drive bays underneath the shroud, bringing the total up to six storage drive locations, which is plenty for most users. Above that, in the front, it is all about cooling. You may install two additional 120 mm fans here or place a 360 mm radiator in the front without sacrificing any expandability. The removable 5.25" bay in the top comes with a tool-less locking mechanism.


The PSU bay underneath the shroud is pretty basic, with foam tips to minimize vibrations moving on to the chassis frame. Above that are the four expansion slots, with each cover held in place by a traditional screw. In the very top, the height-adjustable 120 mm fan with its 3-pin fan header is set to push air out the back.


In the ceiling, you can clearly see the mounting holes for fans or a radiator. Watch out if using a thick 280 mm rad as it may clash with components on the installed motherboard. However, if you are going that route, odds are you will spend more on a chassis as well.


All the cables within the NR400 are of the default variety and completely black.