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Cooler Master MasterBox Q300L Micro-ATX PC Case – vs Rosewill 3U Server Chassis Rackmount Case, 6X 3.5

Updated July 2026 — Cooler Master MasterBox Q300L Micro-ATX PC Case – wins on fan size and height, Rosewill 3U Server Chassis Rackmount Case, 6X 3.5 wins on width and depth.

The Cooler Master MasterBox Q300L is a budget-friendly option with excellent cooling features, while the Rosewill 3U Server Chassis is designed for robust server capabilities. Choose based on your specific needs.

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

Price

MasterBox Q300L is significantly cheaper at $39.99

Cooling

Supports up to five fans and a 240mm liquid cooler

Design

Compact design with a transparent side panel for aesthetics

Why Rosewill 3U Server Chassis Rackmount Case, 6X 3.5 is better

Storage

Rosewill has six internal 3.5" HDD bays

Expansion

E-ATX compatibility with four PCI expansion slots

Noise

Includes two quiet 80mm PWM fans for reduced noise

Overall score

Cooler Master MasterBox Q300L Micro-ATX PC Case –
85
Rosewill 3U Server Chassis Rackmount Case, 6X 3.5
70

Specifications

SpecCooler Master MasterBox Q300L Micro-ATX PC Case –Rosewill 3U Server Chassis Rackmount Case, 6X 3.5
Cooling Support5 fans + 240mm cooler2 fans
Motherboard SizeMicro-ATXE-ATX
USB Ports2 x USB 3.02 x USB 3.0
MaterialSteel + PlasticSteel
ColorBlackSilver/Black

Dimension comparison

Cooler Master MasterBox Q300L Micro-ATX PC Case –Rosewill 3U Server Chassis Rackmount Case, 6X 3.5

Introduction to the Cooler Master MasterBox Q300L and Rosewill 3U Server Chassis

When comparing the Cooler Master MasterBox Q300L and the Rosewill 3U Server Chassis, it's clear that each case is tailored for different user needs. The MasterBox Q300L is priced at $39.99, while the Rosewill chassis is available for $129.99, making the latter about 225% more expensive. This substantial price difference reflects their distinct purposes and features.

Design and Aesthetics

The Cooler Master MasterBox Q300L features a compact design with a transparent side panel that allows users to showcase their build. Its modular I/O panel can be adjusted to six different positions, offering versatility in setup. In contrast, the Rosewill 3U Server Chassis adopts a more utilitarian approach with a silver and black finish and focuses on functionality over flair. Both cases have their own appeal: the MasterBox Q300L is ideal for users wanting a stylish display, while the Rosewill is practical for server setups.

Cooling Capabilities

Cooling performance is another area where these two cases differ significantly. The MasterBox Q300L maximizes cooling with support for a 240mm liquid cooler and can accommodate up to five fans. It comes with one pre-installed 120mm fan, promoting optimal airflow through its perforated design. On the other hand, the Rosewill chassis includes two pre-installed 80mm PWM fans for quiet operation, ensuring adequate airflow for server tasks. While both cases prioritize cooling, the MasterBox Q300L offers more extensive options for enthusiasts looking to overclock or run demanding applications.

Interior Space and Expansion Options

The Cooler Master MasterBox Q300L provides ample interior space for Micro-ATX or Mini-ITX motherboards and can accommodate CPU coolers up to 159mm in height and GPU cards up to 360mm long. This flexibility allows for future upgrades and expansions. Conversely, the Rosewill 3U Server Chassis caters to users needing significant storage capacity, featuring six internal 3.5” HDD bays and four PCI expansion slots. This makes the Rosewill more suitable for users prioritizing storage and server capabilities over aesthetic appeal.

Usability and Accessibility

Usability features are prominent in both cases but serve different purposes. The MasterBox Q300L’s modular I/O panel and clear airflow design enhance accessibility and ease of setup for gaming or multimedia builds. The Rosewill chassis, meanwhile, includes front panel LED indicators for power, HDD, and LAN status, making it easier for server management. Additionally, it offers two USB 3.0 ports for quick data transfers. While both cases facilitate user interaction, their focuses differ: the MasterBox is all about customization, while the Rosewill emphasizes practicality for server environments.

Price Comparison

With a price of $39.99, the Cooler Master MasterBox Q300L is significantly cheaper than the Rosewill 3U Server Chassis, which is priced at $129.99. This makes the MasterBox about 69% less expensive, appealing to budget-conscious users or those who do not require extensive server features. The cost difference reflects the distinct market segments each case targets, with the MasterBox catering to casual or gaming users and the Rosewill designed for professional server applications.

Brand Reputation and Support

Cooler Master is a well-established brand in the gaming and PC building community, known for innovative designs and reliable products. The MasterBox Q300L carries this reputation, offering quality and user-friendly features. Rosewill, while also respected, is often associated with server and enterprise solutions. Users of the Rosewill chassis can expect robust support for server-related inquiries. The brand allegiance may influence purchasing decisions, particularly for those who value service and community feedback.

Which should you buy?

Choosing between the Cooler Master MasterBox Q300L and the Rosewill 3U Server Chassis ultimately hinges on your specific needs. If you are a gamer or a casual user looking for a stylish, compact case with ample cooling options at a budget-friendly price of $39.99, the MasterBox Q300L is an excellent choice. However, if you need a robust server chassis with significant storage capacity and features designed for high-performance applications, the Rosewill at $129.99 may better suit your requirements. Consider your priorities, whether they be aesthetics or functionality, to make the best decision for your build.