CoolerMaster MASTERBOX MB311L ARGB MINI TOWER(MCB-B311L-KGNN-S02)

Gaming On Wide-Open Throttle

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 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 – Two pre-installed 120mm ARGB fans can be managed by the motherboard, and connected by the included splitter, to create a comprehensive ARGB lighting system.


• Optimized Airflow – Airflow is optimized by a collaboration between the Fine Mesh front panel, additional mesh intakes, top panel ventilation, and rear exhaust.


• Tempered Glass Side Panel – Hardware, custom-loop cooling, and the pure pride of the builder is shown in panoramic view through an edge-to-edge tempered glass side panel.


• Adaptable Drive Cage – The drive cage is 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 up to six fans and front, top, and rear radiator support ensure that performance is not compromised.


• Room For Upgrades – Support for up to a 344mm graphics card, a 166mm CPU cooler, and up to a 325mm PSU in length provides room for upgrades to stay ahead of the game.

Product Name			MasterBox MB311L ARGB	MasterBox MB311L ARGB w/ controller
Product Number			MCB-B311L-KGNN-S01	MCB-B311L-KGNN-S02
Exterior Color			Black
Materials	Body		Steel, Mesh, Plastic
	Windowed Side Panel		Tempered Glass
Dimensions (L x W x H)	incl. Protrusions		435.5 x 217.5 x 410mm
Volume (Liters incl. Protrusions)			38.84L
Motherboard Support			Mini-ITX, Micro-ATX
Expansion Slots			4
Drive Bays		5.25“ ODD	N/A
		3.5” / 2.5” Combo	2
		2.5” SSD	2
I/O Panel		USB Ports	2 x USB 3.2 Gen 1 (USB 3.0)
		Audio In / Out	1 x 3.5mm Audio Jack 1 x 3.5mm Mic Jack
		Other	1 x ARGB 2-to-3 Splitter	1 x ARGB Controller 1 x ARGB 2-to-3 Splitter
Pre-installed Fan(s)		Top	N/A
		Front	2 x 120mm ARGB fans
		Rear	N/A
		Bottom	N/A
Fan Support		Top	2 x 120mm / 2 x 140mm
		Front	3 x 120mm* / 2 x 140mm (*can only mount behind the front plate)
		Rear	1 x 120mm
Radiator Support		Top	120 / 240mm
		Front	120 / 140 / 240 / 280mm
		Rear	120mm
Clearances		CPU Cooler	166mm
		Power Supply	325mm (w/o front radiator & drive cage) 140mm (drive cage in backmost position)
		Graphics Card	344mm
Cable Routing		Behind MB Tray	18~22mm
Dust Filters			Front, Top, Bottom
Power Supply Support			Bottom Mount, ATX
Warranty			2 Years