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Cooler Master MasterBox Q300L

In stock > 5 pcs
£35.75 without VAT

Do you want to build a dream gaming or multimedia machine and would like a visually appealing design? In that case, the beautifully designed MasterBox Q300L PC case manufactured by Cooler Master is a great choice for you.

Key Features of the Cooler Master MasterBox Q300L?

  • A high-quality stylish PC case
  • Ideal for mATX and miniITX formats
  • Despite its compact dimensions, it can hold a classic ATX power supply
  • Transparent sidewalls
  • 28mm-wide space for hiding cables
  • A wide choice of fans and coolers
  • A modular I/O panel that can be placed in up to 6 positions

Cooler Master MasterBox Q300L - a Pro at a Reasonable Price

The case is well made and very rugged. It features a transparent sidewall, so you can appreciate the internal components. The case can hold MATX or mini ITX motherboards. In addition, it has a 28mm-wide space behind the motherboard, where you can hide all cables. With a perforated top panel, an optimised airflow is achieved to provide the most efficient cooling of all components. The modular I/O panel can be placed in up to 6 positions, according to your needs. The case is equipped with a headphone jack, a microphone connector and 2 high-speed USB 3.0 ports. Of course, it also features slots with enough room for even larger graphics cards that are up to 360mm long and it can also hold a processor heatsink up to 157mm high.

Powerful and Quiet Cooling

The MasterBox Q300L case is ready to cool even the most powerful hardware, as there is enough room for fans and radiators. Of course, it also supports water cooling and is ready for you to install radiators. Additionally, the case has a good-quality, design-patterned filter that prevents damage from dust and dirt.

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Usage and size

Size Mini Tower


Colour Black

Internal structure

Motherboard form factor mATX (Micro ATX), mITX (Mini ITX)
Number of internal 3.5" slots
Number of internal 2.5" slots
Position of power sources Dole
Additional equipment Dust filters, Supporting SSD (2.5")

External structure

Front panel location From the side
Front panel connectors USB 3.0 (3.1 gen1), Headphones, Microphone
Sidewalls Transparent
Additional equipment Supporting water cooling


Power supply Without power supply

Cooling system

Front fan size 140 × 140 mm
Rear fan size 120 × 120 mm
Number of fan positions
Number of mounted ventilators


Wardrobe material Steel


Width 230 mm (23 cm)
Height 378 mm (37.8 cm)
Depth 387 mm (38.7 cm)
Weight 3.7 kg
Code:  CC022a4b
Warranty: 24 months
Product Number:  MCB-Q300L-KANN-S00