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Black compact Micro-ATX cube case with tempered glass side panel and metal carry handles

Cooler Master

Cooler Master QUBE 340 Q340-KGNN-S00 Micro-ATX PC case

SKU CH-7HMF-QRJ1V MPN Q340-KGNN-S00

Compact Micro-ATX chassis with movable I/O panel, magnetic dust filters, tempered glass side, portable handles and room for 366 mm graphics cards

  • ColorBlack
  • Motherboard CompatibilityMicro ATX / Mini ITX
  • Dust FiltersBottom / Front / Top
  • Internal 3.5" Drive Bays1
  • Internal 2.5" Drive Bays1
  • Expansion Slots4

Size Micro-ATX

  • ATX
  • Micro-ATX

Color Black

  • Place the I/O panel on four orientations for easier cable routing
  • 3D-printable accessories from the QUBE 540 ecosystem let you customise the chassis
  • High-airflow front panel plus multiple fan and radiator mounts keep components cool
  • Fits graphics cards up to 366 mm and CPU coolers up to 178 mm in a compact frame
  • Reconfigurable metal handles move to suit transport or desk layout

Compact Micro-ATX Chassis

The Cooler Master QUBE 340 is a compact tower designed for Micro-ATX and Mini-ITX motherboards. Its footprint resembles a large record crate while still fitting high-performance components. The case includes a movable I/O panel and magnetic dust filters on the bottom, front and top. Metal handles can be repositioned to suit different carrying preferences.

Thermal and Noise Profile

A pre-installed 140 mm rear fan provides baseline exhaust airflow out of the box. The front panel is built for high airflow and supports up to two 140 mm or two 120 mm intake fans. Radiator mounts on the front and top accept 240 mm units, while the rear takes a 120 mm radiator. Magnetic filters on three faces help reduce dust without restricting flow.

Maximum Graphics Card Length

The chassis accommodates graphics cards up to 366 mm long, clearing current flagship models such as the RTX 5080 and RX 9070 XT. CPU air coolers up to 178 mm tall are supported alongside power supplies up to 200 mm deep. Four expansion slots and a single 3.5-inch plus 2.5-inch drive bay complete the internal layout.

Highlights

  • Place the I/O panel on four orientations for easier cable routing
  • 3D-printable accessories from the QUBE 540 ecosystem let you customise the chassis
  • High-airflow front panel plus multiple fan and radiator mounts keep components cool
  • Fits graphics cards up to 366 mm and CPU coolers up to 178 mm in a compact frame
  • Reconfigurable metal handles move to suit transport or desk layout

Specifications

BrandCooler Master
SeriesQUBE Series
ModelQ340-KGNN-S00
ColorBlack
Motherboard CompatibilityMicro ATX / Mini ITX
Dust FiltersBottom / Front / Top
Internal 3.5" Drive Bays1
Internal 2.5" Drive Bays1
Expansion Slots4
Front Ports2 x USB 3.2 Gen1 Type-A
1 x USB 3.2 Gen 2x2 Type-C
1 x 3.5 Mic / Audio Combo Jack x1
Fan OptionsBottom - 1 x 120mm / Bottom - 1 x 140mm / Front - 2 x 120mm / Front - 2 x 140mm / Rear - 1 x 120mm / Rear - 1 x 140mm / Top - 2 x 120mm / Top - 2 x 140mm
Pre-installed FansRear - 1 x 140mm
Radiator OptionsFront - Up to 120mm / Front - Up to 240mm / Rear - Up to 120mm / Top - Up to 120mm / Top - Up to 240mm
Max GPU Length366 mm
Max CPU Cooler Height178 mm
Max PSU Length200 mm
Dimensions374 x 230 x 374 mm
Weight6kg
Shipping weight7.89 kg
Package size508 × 495 × 330 mm

Other versions of this model

2 more in the same range

Same family, different memory, cooler or clock — compare before you commit.

Questions about this item

How do I install the modular I/O panel on the QUBE 340, and which orientation step is often missed?

The I/O panel can be mounted in four positions — top-rear, front-top, top-front, or front-bottom. The step people miss is re-routing the internal USB 3.2 Gen 2x2 Type-C cable to match the new location before securing the panel.

What maintenance will the magnetic dust filters on the bottom, front, and top need later?

Remove each magnetic filter, rinse with water or use compressed air, dry fully, then snap it back into place. No tools are required and the magnets retain their hold after repeated cleaning.

What is the first thermal limit reached when running a 366 mm GPU and 240 mm front radiator under sustained load?

The 178 mm CPU cooler height ceiling becomes the limiting factor; taller air coolers cannot fit once the front 240 mm radiator and fans are installed, forcing a switch to liquid cooling for the CPU.

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