Cooler Master’s Qube 340 is a compact PC case aimed at builders who want a smaller desktop without giving up support for full size components.
Priced at $54.99 in the tested configuration, the case supports Mini ITX and Micro ATX motherboards, ATX power supplies and graphics cards up to 365mm long when no front fan is installed. It also includes removable carry handles, extensive ventilation and a movable front I/O panel.
The main compromises are familiar for a compact case: tighter cable management, some flexible internal metal and a glass side panel secured by a protruding release tab.
Cooler Master Qube 340 specifications
| Feature | Specification |
|---|---|
| Motherboard support | Mini ITX, Micro ATX |
| Power supply support | ATX |
| GPU clearance | Up to 365mm without front fan |
| CPU cooler clearance | Up to 178mm |
| PSU clearance | Up to 200mm without bottom fan |
| Top and front fans | 2 x 120mm or 2 x 140mm |
| Rear and bottom fans | 1 x 120mm or 1 x 140mm |
| Radiator support | 240mm or 120mm top/front, 120mm rear |
| Front I/O | 2 x USB A 3.2 Gen 1, 1 x USB C 3.2 Gen 2x2, 3.5mm audio |
| Dimensions | 386.1 x 230 x 429.4mm including handles and feet |
| Tested price | $54.99 |
The case also ships with a 140mm rear fan preinstalled.
Removable handles make the case easier to move
One of the more unusual parts of the Qube 340 is its pair of removable carry handles.
They make the system easier to move between rooms or locations without turning the case into a permanently portable form factor.
The handles can also be removed, and Cooler Master includes spare dust shields for anyone who prefers the case without them.
That flexibility makes the Qube 340 suitable for a compact gaming PC that may occasionally be moved rather than a system intended to stay under a desk permanently.
The chassis can also be laid flat while building or upgrading components, while rubberized feet help keep it stable in either position.
Airflow is a major part of the design
The exterior is heavily perforated, giving the Qube 340 extensive airflow potential.
It supports multiple 120mm and 140mm fans across the top, front, rear and bottom, while radiator support reaches up to 240mm at the front or top.
The case also includes removable dust protection across its ventilated surfaces.
That makes it possible to prioritize airflow without leaving the system completely exposed to dust buildup.
For builders using an air cooled CPU, the 178mm cooler clearance leaves room for many large tower designs.
Large GPUs can still fit
Despite the compact dimensions, the Qube 340 can accommodate fairly long graphics cards.
The official clearance is 365mm without a front fan.
In testing, a 290mm ASRock Challenger Radeon RX 9070 XT fit with roughly 78mm of remaining space, leaving enough room for additional front cooling in that configuration.
That gives builders more flexibility than many smaller Mini ITX cases, where GPU length can quickly become a limiting factor.
The support for Micro ATX also gives buyers another option if they want a compact system without paying the premium that often comes with Mini ITX motherboards.
Front I/O can be repositioned
The Qube 340 allows its front I/O module to be removed and moved to another position.
That means the power button and ports can be placed at the top or bottom depending on how the system is positioned and where it will be used.
The available ports include two USB A 3.2 Gen 1 connections, one USB C 3.2 Gen 2x2 port and a 3.5mm combo audio jack.
For a desktop placed low to the ground, moving the controls upward can make them easier to reach.
Cable management will require planning
Compact builds inevitably create cable routing challenges, and the Qube 340 is no exception.
There are no dedicated cable channels, although Cooler Master includes several mounting points for zip ties.
Builders using an ATX power supply may need to plan cable lengths and routing carefully, especially if they also install multiple storage drives or additional cooling hardware.
The removable drive tray supports 2.5 inch and 3.5 inch storage, but the metal used for the tray is relatively thin and flexible.
Build quality has a few compromises
The exterior construction is described as solid, particularly around the handles and feet.
Inside, however, some of the metal around the motherboard tray has noticeable flex.
The glass side panel also uses a single protruding tab to stay in place, which could be a concern during transport if it were accidentally released.
The rear panel also requires a screwdriver for safe installation and removal.
These issues are easier to accept given the low price, but they remain important for anyone planning to move the system frequently.
Strong value for a first compact build
At around $55, the Qube 340 combines broad hardware compatibility with features normally associated with more expensive compact cases.
It supports standard ATX power supplies, large GPUs, substantial air cooling and Micro ATX motherboards while remaining small enough to function as a portable desktop.
Its removable handles, repositionable I/O and airflow focused layout are the strongest points.
The thinner internal metal and more demanding cable management are the main compromises.
For experienced builders who want a compact gaming PC without moving into a much smaller and more restrictive case, the Qube 340 offers a practical middle ground.
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