Cooler Master MasterBox Q300L Mini Tower Case

Overview

The Cooler Master MCB-Q300L-KANN-S00 is a mini tower case designed to provide a flexible and efficient solution for compact PC builds. It supports Micro-ATX and Mini-ITX motherboards, accommodating graphics cards up to 14.2 inches long and CPU coolers up to 6.2 inches tall. This case balances space-saving design with component compatibility, making it suitable for gaming rigs, workstations, or general-purpose computers.

Featuring an edge-to-edge transparent acrylic side panel, it allows you to showcase your hardware and lighting effects clearly. The case includes magnetic dust filters on the front, top, and bottom to keep your system clean, while its fully ventilated design and pre-installed 120 mm rear fan ensure effective cooling. Storage options include room for one 3.5-inch hard drive and two 2.5-inch solid-state drives, with cable management space to maintain a neat interior.

Key features

• Supports both Micro-ATX and Mini-ITX motherboards, offering flexibility for various build sizes.
• Edge-to-edge transparent acrylic side panel highlights your components and RGB lighting.
• Magnetic dust filters on all sides help prevent dust buildup and simplify cleaning.
• Fully ventilated design with a pre-installed 120 mm rear fan promotes efficient airflow to keep components cool.
• Adjustable I/O panel with two USB 3.0 ports and audio jacks can be positioned for convenient access in vertical or horizontal setups.
• Space for one 3.5-inch HDD and two 2.5-inch SSDs allows a balance between storage capacity and speed.
• 1.1 inches of hidden cable routing space helps maintain a tidy interior, improving airflow and overall aesthetics.
• Compatible with ATX power supplies up to 6.3 inches deep, supporting a wide range of power options.

Key specs

• Motherboard support: Micro-ATX, Mini-ITX
• GPU clearance: up to 14.2 inches (360 mm)
• CPU cooler clearance: up to 6.2 inches (159 mm)
• Pre-installed fan: 1 x 120 mm rear fan
• Storage bays: 1 x 3.5-inch HDD, 2 x 2.5-inch SSD
• Cable management space: 1.1 inches
• Power supply compatibility: ATX up to 6.3 inches (160 mm)

Connectivity and compatibility

The case’s adjustable I/O panel includes two USB 3.0 ports and audio jacks, providing easy access to essential connections whether the case is positioned vertically or horizontally. This flexibility supports a variety of desktop setups and user preferences, making it easier to connect peripherals and audio devices without reaching behind the case.

Cooling and airflow design

The fully ventilated chassis combined with magnetic dust filters on the front, top, and bottom ensures that air flows freely through the system while keeping dust out. The pre-installed 120 mm rear fan helps exhaust hot air efficiently, and there are multiple mounting points for additional fans or radiators, allowing you to customize cooling based on your components and workload.

Ideal uses and environments

This mini tower case fits well in environments where space is limited but component performance cannot be compromised. It is a strong choice for users building compact gaming PCs, home office workstations, or general-purpose computers that require good airflow and easy maintenance. Its design also appeals to enthusiasts who want to display their hardware clearly while keeping the interior organized and cool.