CM MCB Q300L KANN COOLER MASTER Q300L ATX CASING

Cooler Master MasterBox Q300L mATX Casing – Black

The Cooler Master MasterBox Q300L is a compact and versatile micro‑ATX / mini‑ITX PC case designed for custom builds, gaming systems, and everyday desktops. It features a clear side panel that allows you to showcase internal components and lighting, while its adjustable I/O panel can be repositioned to suit different setups and orientations. The case uses an open, perforated panel design with magnetic dust filters to promote strong airflow and help keep internal temperatures under control, reducing dust buildup and improving long‑term reliability.

Form Factor and Compatibility

• Supports Micro‑ATX and Mini‑ITX motherboards

• Compact footprint suitable for small desks and limited spaces

• Expansion Slots: 4

Cooling and Airflow

• Perforated front, top, and bottom panels for enhanced airflow

• Magnetic dust filters for easy cleaning

• Multiple fan mounting options for flexible cooling configurations

• Supports air cooling and liquid cooling radiator setups

Drive and Component Support

• Drive Bays:

  • Space for 1 × 3.5” HDD

  • Space for 2 × 2.5” SSDs

• GPU Length Clearance: Suitable for most modern graphics cards

• CPU Cooler Height Clearance: Designed to accommodate high‑profile air coolers

• PSU Clearance: Supports standard ATX power supplies

Front I/O and Usability

• Front panel includes USB 3.0 ports and audio ports for convenient access

• Adjustable I/O panel that can be mounted on different edges of the case

• Can be positioned vertically or horizontally depending on desk space or aesthetic preference

• Thoughtful cable routing space behind the motherboard tray for cleaner builds