Remember when a small acrylic window on the side of your case and a red or blue led light was cool af? Oh, the good old days of what like 3-4 years ago? Also going Micro ATX usually meant sacrificing airflow but that is no longer the case.

The MasterBox MB311L ARGB Case promises high airflow in a small footprint. With its fine mesh front panel and two included ARGB 120mm fans you can pack a lot of power into this case and it won’t break the bank.

At the time of writing this up, you can snag the MasterBox MB311L ARGB Case for 89.99 CAD on New Egg.

Key Features

The MasterBox MB311L ARGB is a Micro-ATX airflow PC case pre-installed with two ARGB fans and made to be built with the latest gaming hardware.  The front panel’s façade is made entirely of Fine Mesh, placed between two honeycomb vents on either side to maximize airflow. Since running the latest games, smoothly, means keeping the latest hardware efficiently cooled, top panel ventilation offers the option to add even more cooling hardware—if nothing is mounted, the top panel acts as passive ventilation.

The internal layout was engineered for a high compatibility for the latest gaming hardware while also accounting for future upgrades. Following in the principles of the award-winning MB Series, versatility is paired with presentation to ensure that any gaming system built inside the MasterBox MB311L ARGB looks as good as it performs.

  • Fine Mesh Front Panel – Cooler Master’s Fine Mesh design on the front panel is proven to provide proficient airflow while filtering out dust.
  • Mesh Intakes: Large, mesh intakes span each side of the front panel to provide additional airflow to system.
  • Dual ARGB Fans: Dual pre-installed 120mm ARGB fans with splitter can be managed by the motherboard, to create a customized ARGB lighting system.
  • Tempered Glass: Hardware, custom-loop cooling, or the pure pride of showing off the build in panoramic view through an edge-to-edge tempered glass side panel.
  • Adaptable Drive Cage: The drive cage is movable, able to shift toward the front to accommodate for PSU space, backwards to provide additional radiator space, or even completely removed.
  • Versatile Cooling Options: Support for a total of six 120mm fans and front, top and rear radiator placement ensures that you don’t have to compromise on performance.

MasterBox MB311L ARGB Case Specifications

MasterBox MB311L ARGB Case

MasterBox Series
Mini Tower
Available Color(s)
Plastic, Tempered Glass, Mesh
Dimensions (L x W x H)
435.5 x 217.5 x 410mm, 366.5 x 210 x 400mm
Motherboard Support
Micro ATX, Mini ITX
Expansion Slots
5.25" Drive Bays
2.5" / 3.5" Drive Bays (combo)
2.5" Drive Bays
I/O Panel
2x USB 3.2 Gen 1 (formerly USB 3.0), 1x 3.5mm Audio Jack, 1x 3.5mm 
Mic Jack, 1x ARGB 2-to-3 splitter, 1x ARGB Controller (only for the S02 
Pre-installed Fans - Front
2x 120mm ARGB Fan
Fan Support - Top
2x 120/140mm
Fan Support - Front
3x 120mm, 2x 140mm
Fan Support - Rear
1x 120mm
Radiator Support - Top
120mm, 240mm
Radiator Support - Front
120mm, 140mm, 240mm, 280mm
Radiator Support - Rear
Clearance - CPU Cooler
Clearance - PSU
140mm (HDD cage in backmost position), 325mm (w/o front radiator & HDD cage)
Clearance - GFX
Cable Routing
Dust Filters
Top, Front, Bottom
Power Supply Support
Bottom mount, ATX

Cable Management

Cable management in the MasterBox MB311L ARGB Case is pretty straight forward. There are cutouts in all the standard places you would expect them to be. There is however no GPU six or eight-pin connector cutout as that is where Cooler Master has placed a couple of mounting locations for 2.5-inch SATA drives. Which is not a big deal but thought it was worth mentioning.


Cooling in the MasterBox MB311L ARGB Case is one of the key selling points to this case, so how does it fair? Overall I would say it performs as advertised. The fine mesh front panel is likely to be slightly restrictive but hey at least it’s not a 4mm thick sheet of glass right? Or a cheap acrylic piece of plastic. With one 120mm fan mounted to the rear of the case and one mounted at the top of the case, which is how I typically like to set up my fans. The MasterBox MB311L ARGB Case did a great job of keeping everything at a respectable temperature.

During gaming, my test rig never saw temperatures above the low to mid-50s and the GPU was staying in the low to mid-60s.

Water Cooling Support

  • Radiator Support – Top: 120mm, 240mm
  • Radiator Support – Front: 120mm, 140mm, 240mm, 280mm
MasterBox MB311L ARGB Case front view


During gaming, my test rig never saw temperatures above the low to mid-50s and the GPU was staying in the low to mid-Keeping your new rig clean should be easy enough with the fine mesh front panel and dust filters on the front, bottom, and top of the case.60s.

Front I/O

  • 2x USB 3.2 Gen 1 (formerly USB 3.0), 1x 3.5mm Audio Jack, 1x 3.5mm Mic Jack, 1x ARGB 2-to-3 splitter, 1x ARGB Controller (only for the S02 versions)

The front I/O is pretty standard for this price bracket and there is no USB-Type-C port as that is still a luxury that isn’t yet commonplace for this tier. I am hoping that changes in the next few generations of cases as reaching the type-C port at the rear of the case isn’t always handy.

The power and reset buttons have a nice tactile feel to them. I love that modern cases have all switched to this style of power buttons. My only issue with this style is it isn’t klutz proof. I am a huge klutz and have been known to accidentally turn off the PC by leaning on the I/O without realizing it.

Pricing and availability

This case is available now in Canada. Pricing and availability were up to date at the time of writing this.

First Became Available:

Jan. 22 2020


  • $129.99 CAD on Amazon
  • $89.99 CAD on Newegg

Final Thoughts

The Cooler Master MasterBox MB311L ARGB Case is a great affordable option that will look great as well as offer plenty of cooling and build options. Especially if you are willing to add one fan either at the rear or the top of the case. Alternatively, you could move one of the front fans to the rear or top of the case.

This case offers people who love smaller form factors a great budget-friendly option.


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