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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

  • Max graphics card length366 mm
  • Supported motherboard sizesMicro ATX / Mini ITX
  • Dust filteringBottom / Front / Top
  • 3.5-inch internal bays1
  • 2.5-inch internal bays1
  • Expansion card slots4

Size 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.

How it compares

Measured against everything we stock in Tower & Desktop PC Cases, at today’s prices. Recalculated every night.

Price $45.99
Cheaper than about 91% of the 1,468 comparable items (median $100.99).
Max graphics card length 366 mm
Lower than about 68% of the 894 comparable items (median 400 mm).

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Specifications

Product
Brand nameCooler Master
Product lineQUBE Series
Model nameQ340-KGNN-S00
Product colorBlack
Storage
3.5-inch internal bays1
2.5-inch internal bays1
Ports & slots
Expansion card slots4
Front panel ports2 x USB 3.2 Gen1 Type-A
1 x USB 3.2 Gen 2 × 2 Type-C
1 × 3.5 Mic / Audio Combo Jack x1
Size & build
Max graphics card length366 mm
Dust filteringBottom / Front / Top
Fan mounting optionsBottom - 1 × 120 mm / Bottom - 1 × 140 mm / Front - 2 × 120 mm / Front - 2 × 140 mm / Rear - 1 × 120 mm / Rear - 1 × 140 mm / Top - 2 × 120 mm / Top - 2 × 140 mm
Product dimensions374 × 230 × 374 mm
Product weight6kg
Shipping weight7.89 kg
Package size508 × 495 × 330 mm
Compatibility
Supported motherboard sizesMicro ATX / Mini ITX
Radiator supportFront - Up to 120 mm / Front - Up to 240 mm / Rear - Up to 120 mm / Top - Up to 120 mm / Top - Up to 240 mm
CPU cooler height limit178 mm
PSU length limit200 mm
More details
Included fansRear - 1 × 140 mm

Other versions of this model

2 more in the same range

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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