PC CASE

Built for Performance & Style
The QUBE 340 / 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 QUBE 340 / Q300L V3 provides a smooth, straightforward building experience while allowing you to personalize both aesthetics and functionality.

POWERFUL COOLING CAPABILITY
High-airflow front panel and support for multiple fan and radiator keeps systems running cool and smooth.

PERFORMANCE IN PERFECT FIT
Provides generous components clearance to enable high-performance, compact builds.

ACCESS MADE EASY
Position the I/O panel on the top or bottom to keep connections within easy reach.

FLEXIBLE ORIENTATIONS
Whether vertical or horizontal, tailor builds to fit any space, setup, and workflow.

PERSONALIZE YOUR BUILD
The QUBE 340 includes handles, a headphone hook, and supports QUBE 3D-printable accessories for even more customization flexibility.

Design
Material: SGCC, Tempered glass, Mesh
Form factor: Desktop
Type: PC
Product colour: Black
Supported motherboard form factors: Mini-ITX, micro ATX
Number of 3.5" bays: 1
Number of 2.5" bays: 2
Number of expansion slots: 4
Feature: Anti-dust filter
Feature: Cable management
Maximum CPU cooler height: 17.8 cm
Maximum graphics card length: 36.6 cm
Maximum PSU length: 20 cm
Power supply
Power supply location: Bottom
Supported power supply form factors: ATX
Ports & interfaces
Audio input: Yes
Audio output: Yes
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity: 2
USB 3.2 Gen 2x2 Type-C ports quantity: 1
Cooling
Number of front fans supported (max): 2
Front fans diameters supported: 120,140 mm
Rear fans installed: 1x 140 mm
Number of rear fans supported (max): 1
Rear fans diameters supported: 120,140 mm
Number of top fans supported (max): 2
Top fans diameters supported: 120,140 mm
Number of bottom fans supported (max): 1
Bottom fans diameters supported: 120,140 mm
Front radiator sizes supported: 240,120 mm
Rear radiator sizes supported: 120 mm
Top radiator sizes supported: 120,240 mm
Storage
Supported HDD sizes: 2.5,3.5"
Technical details
Commercial warranty: 2 year(s)
Weight & dimensions
Width: 386.1 mm
Depth: 230 mm
Height: 388.5 mm
Other features
Cable management clearance: 3 cm
Volume: 34.5 L