Cooler Master Q300L V3 M-ATX Mini Tower Case

The Cooler Master Q300L V3 is a Micro-ATX mini tower chassis designed for builders who want capable thermal performance without occupying excessive desk space. Drawing from Cooler Master's Thermal Excellence philosophy, the case features enlarged front-panel mesh perforations to maximise fresh-air intake, and an upgraded rear position that accepts either a 120 mm or a 140 mm exhaust fan. The result is an intake-to-exhaust airflow path suited to mainstream high-TDP platforms. As part of the QUBE family, the Q300L V3 carries the series' modular DNA into the entry mATX segment. Front I/O placement is flexible, and front-panel mounting points support 3D-printed accessories. The chassis accommodates vertical or horizontal orientation and is compatible with optional carry handles (sold separately), so it can adapt to workbench, LAN-party, or desktop use-cases without structural modification. Inside, an improved motherboard tray and a reworked fan-mounting layout reinforce chassis rigidity while keeping the build process approachable. A dedicated 30 mm cable-routing channel behind the tray encourages tidy cable runs, reducing obstruction to internal airflow. Storage is handled by one 3.5-inch bay, one 3.5-inch/2.5-inch combo bay, and two dedicated 2.5-inch bays, for a maximum of four 2.5-inch drives. This is the Lite (handle-free) variant of the Q300L V3, retaining the core design language while keeping the price accessible. Verified Specifications • Form Factor: Micro-ATX / Mini-ITX • Colour: Black • Material: SGCC steel, tempered glass, mesh • Pre-installed Fans: 1 × 140 mm (rear, non-ARGB) • Fan Support: Top 2 × 120/140 mm; Front 2 × 120/140 mm; Rear 1 × 120/140 mm; Bottom 1 × 120/140 mm — up to 6 fans total • Radiator Support: Top 240/120 mm; Front 240/120 mm; Rear 120 mm • Max CPU Cooler Height: 178 mm • Max GPU Length: 366 mm (without front fan installed) • Max PSU Length: 200 mm (without bottom fan) / 140 mm (with bottom fan) • Drive Bays: 1 × 3.5", 1 × 3.5"/2.5" combo, 2 × 2.5" (max 4 × 2.5" SSD) • Expansion Slots: 4 • Front I/O: USB 3.2 Gen 1 Type-A, USB 3.2 Gen 2×2 Type-C, audio combo jack, mic port • Dust Filters: Top, front, bottom • Warranty: 2 years