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Cooler Master MasterBox Q300L Micro-ATX PC Case – vs Lian Li A3-mATX-WD-26.3L Micro Form Factor

Updated July 2026 — Cooler Master MasterBox Q300L Micro-ATX PC Case – wins on depth and volume, Lian Li A3-mATX-WD-26.3L Micro Form Factor wins on width and fan slots.

The Cooler Master MasterBox Q300L offers excellent value with its modularity and affordability, while the Lian Li A3 provides superior aesthetics and hardware support. Choose based on your priorities.

Why Cooler Master MasterBox Q300L Micro-ATX PC Case – is better

Price

MasterBox Q300L is significantly cheaper at $39.99.

Modularity

Adjustable I/O panel enhances customization.

Dust Management

Includes magnetic dust filters for easier maintenance.

Why Lian Li A3-mATX-WD-26.3L Micro Form Factor is better

Cooling

Supports a 360mm radiator and more fans.

Aesthetics

Stylish walnut wood front panel for a premium look.

GPU Support

Accommodates longer GPUs up to 415mm.

Overall score

Cooler Master MasterBox Q300L Micro-ATX PC Case –
75
Lian Li A3-mATX-WD-26.3L Micro Form Factor
85

Specifications

SpecCooler Master MasterBox Q300L Micro-ATX PC Case –Lian Li A3-mATX-WD-26.3L Micro Form Factor
Cooling Support240mm liquid cooler360mm radiator
Motherboard SizeMicro-ATXmATX/ITX
GPU Length360mm415mm
PSU CompatibilityATXATX/SFX
Dust FiltersYesNo

Dimension comparison

Cooler Master MasterBox Q300L Micro-ATX PC Case –Lian Li A3-mATX-WD-26.3L Micro Form Factor

Overview of the Products

The Cooler Master MasterBox Q300L Micro-ATX PC Case is priced at $39.99, while the Lian Li A3-mATX-WD-26.3L Micro Form Factor Chassis has a higher price of $89.99, making it about 125% more expensive. Both cases cater to compact builds but differ significantly in design philosophy and features. The MasterBox Q300L emphasizes modularity and airflow, while the Lian Li A3 focuses on a stylish aesthetic and high-performance hardware support.

Design and Aesthetics

The Cooler Master MasterBox Q300L features a practical cube design with a transparent side panel that allows users to showcase their build. Its unique magnetic dust filters not only serve a functional purpose but also add to its distinctive look. In contrast, the Lian Li A3 boasts a stylish walnut wood front panel that contributes to a clean, minimalist appearance. This design choice makes it visually appealing for those seeking a more upscale look in their PC setup. While both cases are visually striking, the choice between a more utilitarian style versus a sophisticated wood finish may influence buyers' preferences.

Cooling Capabilities

The MasterBox Q300L supports a maximum cooling configuration with a 240mm liquid cooler and up to 5 fans, ensuring ample airflow for cooling high-performance components. Its open thermal design promotes optimal heat dissipation, making it suitable for gamers and content creators alike. On the other hand, the Lian Li A3 can accommodate a 360mm radiator and up to 10 x 120mm fans, providing superior cooling capabilities for high-TDP GPUs and demanding setups. This makes the Lian Li A3 a better option for users who prioritize advanced cooling solutions in their builds.

Interior Space and Compatibility

The MasterBox Q300L offers ample interior space for Micro-ATX or Mini-ITX motherboards and supports CPU coolers up to 159mm in height and GPU cards up to 360mm. This flexibility allows for future expansion and customization. In comparison, the Lian Li A3 is designed for compact setups, accommodating mATX and ITX motherboards with 4 expansion slots, and it can support GPUs up to 415mm long. This additional GPU length makes the Lian Li A3 more versatile for users who want to install high-end graphics cards without compromise.

Modularity and Customization

In terms of modularity, the MasterBox Q300L allows users to adjust the I/O panel to various locations on the case, enhancing flexibility based on individual setups. This feature is particularly beneficial for users who may want to place their case in different orientations. The Lian Li A3, meanwhile, features a modular design that allows for flexible PSU installation in multiple orientations, enhancing cable management and clearance. While both cases offer modular features, the MasterBox Q300L's adjustable I/O panel provides a unique level of customization that may appeal to builders looking for tailored setups.

Dust Management

The Cooler Master MasterBox Q300L incorporates magnetic dust filters that not only keep the interior clean but also add a unique visual element to the case. This practical design feature helps maintain the longevity and performance of components by preventing dust buildup. In contrast, the Lian Li A3 does not specify any dust management features, which could be a consideration for users in dust-prone environments. The inclusion of dust filters in the MasterBox Q300L gives it an advantage in terms of maintenance and upkeep.

Price Comparison

At $39.99, the Cooler Master MasterBox Q300L is significantly more budget-friendly compared to the Lian Li A3, which retails for $89.99. This price difference of $50 makes the MasterBox Q300L about 44% cheaper. For users who are looking to build a capable PC without breaking the bank, the MasterBox Q300L presents a compelling value. However, the Lian Li A3 may justify its higher price with its superior hardware support and aesthetic appeal, targeting users willing to invest more for better features.

Which should you buy?

Choosing between the Cooler Master MasterBox Q300L and the Lian Li A3 ultimately depends on your specific needs and budget. If you prioritize affordability, modularity, and efficient cooling in a compact design, the MasterBox Q300L is an excellent choice at $39.99. However, if you're willing to invest more for enhanced aesthetics, superior hardware compatibility, and advanced cooling options, the Lian Li A3 at $89.99 may be worth the extra cost. Each case has its strengths, so consider what features matter most for your build.