Description
Powerfully Compact and Cool
The QUBE 340 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 QUBE 340 / Q300L V3 provides a smooth, straightforward building experience while allowing you to personalize both aesthetics and functionality.
Key Features
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High Airflow Cooling — High-airflow front panel with support for multiple fans and radiators
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Optimum Clearance Design — Up to 366 mm GPU clearance and 178 mm CPU cooler clearance
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Adjustable I/O Panel — Position on top or bottom to suit your workspace
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Flexible Orientations — Use vertically or horizontally to fit any setup
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QUBE Ecosystem Support — Compatible with handles, headphone hook, and 3D-printable accessories
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Mini-ITX & Micro-ATX Support — Accommodates a wide range of compact builds
Specifications
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Materials: SGCC + TG / Mesh
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Dimensions (Incl. Protrusions): 386.1 × 230 × 429.4 mm | 38.13 L
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Dimensions (Excl. Protrusions): 374 × 230 × 374 mm | 32.17 L
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Motherboard Support: Mini-ITX, Micro-ATX
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CPU Cooler Clearance: 178 mm
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GPU Clearance: 366 mm (without front fan)
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PSU Clearance: 200 mm (no bottom fan) / 140 mm (with bottom fan)
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Expansion Slots: 4
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Drive Bays: 1× 3.5", 1× 3.5"/2.5" Combo, 2× 2.5" (max 4)
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Fan Support: Top: 2× 120/140 mm | Front: 2× 120/140 mm | Rear: 1× 120/140 mm | Bottom: 1× 120/140 mm
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Pre-installed Fan: 1× 140 mm non-ARGB (Rear)
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Radiator Support: Top/Front: 240/120 mm | Rear: 120 mm
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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
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Cable Routing: 30 mm behind MB tray
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PSU Support: ATX
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Dust Filters: Top / Front / Bottom
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Colors: Black (Q340-KGNN-S00) / White (Q340-WGNN-S00)
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Included Accessories: Filter (with Perforations), Headphone Holder
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Warranty: 2 Years
Product: Product Sheet
