Cooler Master Reveals MasterBox Q300L V2 mATX Case

Cooler Master has today revealed its new MasterBox Q300L V2 Micro-ATX chassis, a rejuvenated and revitalized successor to the original MasterBox 300L

Cooler Master MasterBox Q300L V2

The MasterBox Q300L V2 is a new redesigned variant of the existing MasterBox Q300L case. The case is a smaller Micro-ATX case coming in at 387 x 230 x 383mm (L x W x H) and features a redesigned dust filter which is more optimized for airflow and maintaining a clean interior. The case features a tempered glass side panel for showcasing your build and comes with next-gen I/O connectivity with a USB 3.2 Type-C port as well as two Type-A ports and an audio jack.

What Cooler Master Had To Say

“The MasterBox Q300L V2 is a testament to Cooler Master’s ongoing commitment to innovation, efficiency and delivering superior thermal performance,” said Jimmy Sha, CEO of Cooler Master. “We’ve pushed the boundaries of the mATX format to ensure our users never have to compromise between space, performance and aesthetics.”

Cooling Support

The case offers room for up to 6 fans with two 120mm or 140mm fans in the front, two 120mm in the top and one in the back which comes pre-installed and one in the bottom. For radiators, there is enough room for up to a 240mm radiator in the front.

Hardware Compatibility

Despite the small size users are able to fit up to a 159mm tower cooler, 360mm of GPU length, up to 160mm of ATX power supply which also can be cable managed with 28mm of cable management space behind the motherboard tray. For storage, there is a single 3.5″ bay and two 2.5″ bays behind the motherboard tray.


  • Next-Gen Connectivity: Incorporates a USB 3.2 Gen 2×2 Type C port on the I/O panel, ensuring swift data transfer speeds of up to 20GB/s.
  • Compact Design, Full-Sized PSU Capable: Despite measuring only 370mm x 370mm, this space-efficient mATX case can comfortably house a standard ATX PSU.
  • Optimized Dust Filter: Newly redesigned patterned dust filter optimizes airflow and maintains a clean, cool PC interior.
  • Uncluttered Cable Management: With 28mm of space behind the motherboard tray, hiding cables and maintaining a clean build is easy.
  • Superior Thermal Performance: Perforated front, top and bottom sections guarantee exceptional thermal management.
  • Tempered Glass Side Panel: Showcase your build with the 4mm-thick tempered glass side panel, secured with convenient thumbscrews.

Price and Availability

The Q300L V2 will be available with a 2 year warranty in all major UK PC components retailers from 5th September 2023 (TBC). with an MSRP of £59.99.

Jakob Aylesbury

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