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Cooler Master MasterBox Q300P Micro ATX Tower w/ Front & Top Dark Mirror Panel, Transparent Acrylic Side Panel, Adjustable I/O & 2x 120mm RGB Fans w/RGB Controller

In stock.
Ships from China.
Most customers receive within 4-17 days.
  • Included: 2 x 120mm RGB LED Fans, 1 x RGB Controller, 1 x RGB Splitter w/ 4 pin adapters, 4 removable handles for easy carrying/transporting
  • I/O panel can be adjusted in 6 different locations and the Case can be positioned: vertical or horizontal
  • Body depth height: can support normal size ATX power supply
  • Edge-to-Edge Acrylic Transparent Side Panel offers a full view inside
  • Extra space behind the motherboard tray for hidden cable management
Cooler Master

Choose Your Style

The MasterBox Q300P is your portable option in the MasterBox Q-series from Cooler Master, a series that might be small in size but excels in functionality, modularity, and thermal performance.

Cooler Master

System Flexibility

The I/O panel can be adjusted to six different locations—on both side of the body you can install the I/O panel at the front, top or bottom.

Cooler Master

Easy Handling

Four removable handles make it easy to transport your full system build to a LAN Party and elsewhere.

Cooler Master

Small Form Factor, ATX PSU Support

Despite the Micro-ATX form factor and the body depth/height of only 370 x 370mm, the MasterBox Q300P can accommodate a normal ATX PSU.

Cooler Master

Edge-to-Edge Acrylic Side Panel

Show off your build through the full size transparent side panel.

Cooler Master


Two pre-installed 120mm RGB LED fans behind the front panel and RGB lighting at the top front can create an amazing lighting effect.

Cooler Master

Routing Space

A space 28mm-wide behind the motherboard tray offers open space for hidden cable management.

Cooler Master

RGB Lighting Control, Out of the Box

One RGB controller is included with the Q300P. If your MB does not support the RGB control function, you can connect the RESET button cable and control the RGB lighting directly from the I/O panel.

Cooler Master

1-to-3 Splitter Cable for RGB Fans

The RGB Connector Splitter and 4 pin male to male adapters are included. Certified compatible with ASUS, Gigabyte, MSI, and ASRock motherboards.


  Cooler Master Cooler Master
  Q300P Q300L
Product Number MCB-Q300P-KANN-S02 MCB-Q300L-KANN-S00
Available Color Black Black
Materials Steel, Plastic Steel, Plastic
Dimensions, L x W x H 450 x 230 x 450mm 387 x 230 x 378mm
Motherboard Suport Micro-ATX, Mini-ITX Micro-ATX, Mini-ITX
Expansion Slots 4 4
Drive Bays 5.25" 0 0
3.5" HDD 1 1
2.5" SSD 2 2
I/O Port USB 3.0 x 2, Audio In/Out USB 3.0 x 2, Audio In/Out
Pre-Installed Fan(s) Front 120mm RGB LED x2 n/a
Rear 120mm x1 120mm non-LED x1
Fan Support Front 120 / 140mm x2 120 / 140mm x2
Top 120mm x2 120mm x2
Rear 120mm x1 120mm x1
Bottom 120mm x1 120mm x1
RGB Controller Included Included
Radiator Support Front 120mm x1 / 240mm x1 120mm x1 / 240mm x1
Rear 120mm x1 120mm x1
Clearances CPU Cooler 157mm 157mm
PSU 160mm 160mm
GPU 360mm 360mm
Cable Routing Behind MB Tray 28mm 28mm
Dust Filters Bottom Bottom
Power Supply Support Bottom Mount, ATX PS2 Bottom Mount, ATX PS2
EAN Code 4719512065518 4719512065488
UPC Code 884102038037 884102038006
Net Weight 5.2 kg 3.7 kg
Gross Weight 6.4 kg 4.7 kg
Carton Dimensions, L x W x H 510 x 277 x 527mm 435 x 276 x 461mm

Warranty & Returns

Warranty, Returns, And Additional Information


  • Limited Warranty period (parts): 1 year
  • Limited Warranty period (labor): 1 year
  • Read full details

Return Policies