Cooler Master MasterBox Q300L
Cooler Master MasterBox Q300L
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Cooler Master MasterBox Q300L

Mid-tower - Black - Steel, Plastic - 3 x Bay - 1 x 4.72" x Fan(s) Installed - 0 - Micro ATX, Mini ITX Motherboard Supported - 6 x Fan(s) Supported - 0 x External 5.25" Bay - 1 x Internal 3.5" Bay - 2 x Internal 2.5" Bay - 4x Slot(s) - 2 x USB(s) - 1 x Audio In - 1 x Audio Out

MFG. PART: MCB-Q300L-KANN-S00 UPC: 884102038006
Warranty: 2 Year Warranty
  • Micro-ATX and Mini-ITX
  • 1 x 3.5" Drive Bay
  • 2 x 2.5" Drive Bays
  • 4 x Expansion Slots
  • USB 3.0 and Audio In/Out Ports
  • 120mm Rear Fan Included
  • Supports GPUs up to 14.2" Long
  • Supports CPU Coolers up to 6.2" Tall
  • Clean Routing Space
  • Cooler Master MasterBox Q300L
  • Cooler Master MasterBox Q300L Mini Tower Case
  • Limited 2-Year Warranty
I/O panel can be adjusted in 6 different locations and the Case can be positioned: vertical or horizontal
Edge-to-Edge Acrylic Transparent Side Panel offers a full view inside
Body depth height: can support normal size ATX power supply
Front Magnetic Design Dust Filter with open perforated front, top and bottom for high air performance
Extra space behind the motherboard tray for hidden cable management

Choose Your Style
The MasterBox Q300L is your straightforward 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.

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.

Magnetic Dust Filters
Patterned magnetic filters create a unique look for your chassis while keeping your system's internals free from excess dust.

Small Form Factor, ATX PSU Support
Despite the Micro-ATX form factor and the body depth/height of only 370 x 370mm, the MasterBox Q300L can accommodate a normal ATX PSU.

Edge-to-Edge Acrylic Side Panel
Show off your build through the full size transparent side panel.

General Information

Manufacturer: Cooler Master Co., Ltd
Manufacturer Part Number: MCB-Q300L-KANN-S00
Manufacturer Website Address:
Brand Name: Cooler Master
Product Line: MasterBox
Product Model: MCB-Q300L-KANN-S00
Product Name: MasterBox Q300L
Product Type: Computer Case

Technical Information

Motherboard Supported: Micro ATX, Mini ITX
Number of Fans Supported: 6
Number of Fans Installed: 1
Installed Fan Size: 4.72" (120 mm)


Number of External 5.25" Bays: 0
Number of Internal 3.5" Bays: 1
Number of Internal 2.5" Bays: 2
Number of Total Expansion Bays: 3

I/O Expansions

Number of Total Expansion Slots: 4


Total Number of USB Ports: 2
Total Number of Audio In Ports: 1
Total Number of Audio Out Ports: 1

Power Description

Power Supply Installed: No
Number of Power Supplies Supported: 1
Number of Power Supplies Installed: 0

Physical Characteristics

Product Color: Black
Product Material: Steel, Plastic
Form Factor: Mid-tower
Height: 14.88" (378 mm)
Width: 9.06" (230 mm)
Depth: 15.24" (387 mm)
Weight (Approximate): 3.70 kg


Country of Origin: China


Limited Warranty: 2 Year
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