A Closer Look - Inside

To access the interior of the Masterbox MB311L ARGB, simply remove the thumb screws holding each panel in place. The interior is all black, and Cooler Master actually skipped grommets within this case, which is weird as the NR400 which uses the same frame as the MB311L ARGB comes with them pre-installed. On top of the shroud you will find two mounting positions for 2.5" drives, which can easily be seen when looking at the internals through the windowed side.


The backside holds no surprises, but offers 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. However, Cooler Master does not include enough mounting hardware to fill all four of these locations—you have to make due with picking two.


Last but not least are two additional 3.5" hard-drive bays underneath the shroud, which brings the total up to four possible storage drives. Above that, in the front, it is all about cooling. You may install an additional 120 mm fans on top of the two ARGB units here or place a 360 mm radiator in the front without sacrificing any expandability.


The PSU bay underneath the shroud is pretty basic, with foam tips to minimize and absorb vibrations before they reach the chassis frame. Above that are the four expansion slots. Each cover is unfortunately of the breakout kind. The very top has room for a height-adjustable 120 mm fan.


In the ceiling, you can clearly see the mounting holes for fans or a radiator. Watch out if using a thick 280 mm radiator 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 Cooler Master Masterbox MB311L ARGB are of the default variety and completely black. You will also find a pre-installed ARGB splitter which combines the leads from the fans into a single plug that may then be connected directly to your motherboard or the separately included controller.