Q300L V3

Compact Performance, Streamlined Design The Q300L V3 is a compact Micro-ATX PC case designed for serious performance. Engineered with Cooler Master’s Thermal Excellence, it maximizes airflow to keep your system cool and stable - even with high-TDP components. Designed to accommodate longer GPUs and taller air coolers, it provides rigidity and efficient layouts with optimized airflow. Its modular design offers repositionable I/O panels, vertical or horizontal orientation, and support for accessories like handles and 3D-printable components. Ideal for DIY builders and system integrators, the Q300L V3 provides a smooth, straightforward building experience while allowing you to personalize both aesthetics and functionality. Key Features High Airflow Cooling — High-airflow front panel with support for multiple fans and radiators Optimum Clearance Design — Up to 366 mm GPU clearance and 178 mm CPU cooler clearance Adjustable I/O Panel — Position on front panel top or bottom, or top panel front Flexible Orientations — Use vertically or horizontally to fit any setup Mini-ITX & Micro-ATX Support — Accommodates a wide range of compact builds Specifications Materials: SGCC + TG / Mesh Dimensions (Incl. Protrusions): 386.1 × 230 × 388.5 mm | 34.5 L Dimensions (Excl. Protrusions): 374 × 230 × 374 mm | 32.17 L Motherboard Support: Mini-ITX, Micro-ATX CPU Cooler Clearance: 178 mm GPU Clearance: 366 mm (without front fan) PSU Clearance: 200 mm (no bottom fan) / 140 mm (with bottom fan) Expansion Slots: 4 Drive Bays: 1× 3.5", 1× 3.5"/2.5" Combo, 2× 2.5" (max 4) Fan Support: Top: 2× 120/140 mm | Front: 2× 120/140 mm | Rear: 1× 120/140 mm | Bottom: 1× 120/140 mm Pre-installed Fan: 1× 140 mm non-ARGB (Rear) Radiator Support: Top/Front: 240/120 mm | Rear: 120 mm I/O Panel: 2× USB 3.2 Gen1 Type-A, 1× USB 3.2 Gen 2×2 Type-C, 1× 3.5 mm Audio Combo I/O Panel Placement: Front Panel (Top/Bottom), Top Panel (Front) Cable Routing: 30 mm behind MB tray PSU Support: ATX Dust Filters: Top / Front / Bottom Colors: Black (Q300LV3-KGNN-S00) / White (Q300LV3-WGNN-S00) Handles: No QUBE Ecosystem Support: No Included Accessories: None Warranty: 2 Years Product Sheet: Product Sheet