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Cooler Master MasterBox Q300P Gaming Case - Black

CCL Code: CAS3311
Manufacturer Code: MCB-Q300P-KANN-S02
Manufacturer: Cooler Master
Cooler Master MasterBox Q300P Gaming Case - Black

Key Features:

  • PSU not included
  • 0 x 5.25" External Bay(s)
  • 2 x 2.5", 1 x 3.5" HDD Bay(s)
  • Max MB Size: Micro-ATX
  • LED Lighting


Sorry, this product has been discontinued. We have found some similar products below.

The MasterBoxQ300P is your portable option in the lineup of the brand new MasterBoxQ-series from Cooler Master. A series that might be small in size but excels in functionality and modularity without compromising on the thermal performance.

Four removable handles and the DarkMirrorfront and top panels makes the chassis easy to transport and stands out from the rest. Although the size wouldn’t tell, the MasterBoxQ300P supports a standard ATX PSU which we don’t see often in the market with this size. Due to the cube design of the frame you can turn and rotate this chassis in multiple positions. The I/O panel can be adjusted to six different locations, three options at each side of the case. Two RGB fans are pre-installed in the front of the case. You can decide which setup and color theme fits you best.

The combination of the portable design and the unique exchangeable outlook makes the MasterBoxQ300P the perfect choice for gamers and creative builders.


  • Max GPU Length: 360mm
  • Max CPU Cooler Height: 157mm
  • Max PSU Depth: 160mm
  • Cable Routing Space: 28mm

Main Features

  • RGB LIGHTING - Use the RGB lighting to create a captivating build in your preferred color theme with the included RGB controller.
  • EASY TO HANDLE - Four removable handles make it easy to transport or carry your full system build to a LAN Party.
  • MODULAR I/O PANEL - 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.
  • MULTIPLE POSITIONING OPTIONS - The case can be put in vertical and horizontal position.
  • EDGE-TO-EDGE SIDE PANEL - Show off your build through the full size transparent side panel.
  • CLEAN ROUTING SPACE - Behind the motherboard tray, it offers 28mm wide and spacy room for hidden cable management.

User Controls

User Controls Power


Internal Expansion Bays 2 x 2.5"
1 x 3.5"


Expansion Slots 4 x Full Height


USB Ports 2 x USB 3.0
Headphone Ports 1 x 3.5mm Jack
Microphone In Port 1 x 3.5mm Jack


Cooling System Front: Supports 2 x 120/140mm fans (2 x 120mm RGB LED fans included)
Top: Supports 2 x 120mm fans
Rear: Supports 1 x 120mm fan (included)
Bottom: Supports 1 x 120mm fan
Power Supply ATX Power Supply supported


Form Factor Mini Tower
Case Colour Black
Material SECC Steel
LED Status Indicators HDD
Motherboard Compatibility Micro-ATX
Mini ITX
Width 230 mm
Depth 450 mm
Height 450 mm
Weight 5.2 kg


Warranty 2 Years

Key Features

Firewire No
Main Colour Black
Case Type Tower
USB 3.0 Support Yes
Case Form Factor Mini Tower
Power Supply Included No
Optimised for Gaming
80Plus Rated No
PSU Form Factor ATX
Display Model in Showroom No
Illuminated Yes
Internal 3.5" Bay 1
Internal 2.5" Bay 2
Micro-ATX Yes
Cooler Height 157 mm
Built-in Card Reader No
USB Type-C Support No
Front HDMI No
Side Panel Type Windowed
GPU Length 360 mm
PSU Depth 160 mm
Front Audio Type Separate
Maximum Motherboard Size Supported Micro-ATX

Item Details

Manufacturer Cooler Master
Manufacturer Code MCB-Q300P-KANN-S02
EAN 4719512065518
Condition New

Warranty Information

Warranty 2 Years

Manufacturer Information

Manufacturer Cooler Master
Manufacturer Code MCB-Q300P-KANN-S02

Do you have you a question about the Cooler Master MasterBox Q300P (Micro-ATX/Mini-ATX) Mini Tower Case (Black)?

Q: what comes included with this case
Answer by Website User on 2nd July 2019
Unfortunately even looking through the product information and manual we can still not find out what comes with the case. - Kristian N
0 customers found this answer helpful.
Post Answer
3 / 5 2 reviews


10 months ago

Very poor for the price the plastic windows are a big let down worst iv ever come across and no psu bit of a ripoff even at reduced price of 60 i have had better products from China for a half the price i wouldn't buy this one guys the plastic will brake green house glass would be better lol looks nice tho


November 2018

Great budget Case and included ML240 Rad is great too

PDF Datasheets and Manuals

Document File type File size
Product Sheet pdf