Cooler Master MasterBox Q300L
Budget mATX mini‑tower with 360 mm GPU, 159 mm cooler, 240 mm rad support, and a six‑position modular I/O panel.
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Product overview
Launched on March 1, 2018, the MasterBox Q300L is part of Cooler Master’s MasterBox Q‑series (the Q300 line alongside the Q300P). It’s a budget‑tier micro‑ATX mini‑tower built to keep costs down while still accepting a standard ATX PSU and full‑length GPUs.
It suits airflow builds and budget builds that still need high GPU clearance: room for 360 mm graphics cards, 159 mm air coolers, and a 240 mm front radiator. Cooling mounts include 2×140 mm front, 2×120 mm top, 120 mm rear, and 120 mm bottom. Storage is basic (1×3.5 in + 2×2.5 in). Front I/O is 2× USB 3.0 plus separate mic/headphone jacks, and the side‑mounted I/O block can be relocated to six positions. Perforated panels with magnetic dust filters and an edge‑to‑edge transparent side panel round out a simple, compact layout.
- airflow builds
- budget builds
- high GPU clearance
- water cooling/radiators
Product highlights
- I/O panel can be adjusted in 6 different locations and the Case can be positioned: Vertical or horizontal
- Edge to edge acrylic transparent side panel offers a full view inside
- Body depth height: Can support normal size ATX power supply
- Front magnetic design dust filter with open perforated front, top and bottom for high air performance
- Extra space behind the motherboard tray for hidden cable management
- Motherboard Support: Micro ATX, Mini ITX, CPU Cooler: 159mm/6.2", GPU 360mm, Radiator Support Front: 120mm/240mm, Rear: 120mm
Specifications
- Form factor
- mATX
- Color
- Black
- Tempered glass
- Yes
- Dimentions
- 15.39 x 9.06 x 15
- Weight
- 1.06
- I O Ports
- 2x USB 3.0, 1x MIC, 1x AUX
- Expansion Slots
- 4
