Cooler Master V850 SFX Gold vs JUSTOP Black 700W Power Supply Unit ATX PSU With 120MM Quiet Fan

Overview of the Power Supplies

When comparing the Cooler Master V850 SFX Gold and the JUSTOP Black 700W Power Supply Unit, the first notable difference is their pricing. The Cooler Master V850 SFX Gold is priced at £134.56, while the JUSTOP is significantly cheaper at £29.95. This price disparity reflects the differences in their specifications, intended use, and overall performance.

The Cooler Master is designed for small form factor systems, making it ideal for compact builds, whereas the JUSTOP caters to more traditional ATX setups. Each product serves different needs, which is crucial to consider when choosing the right power supply for your build.

Power Output and Efficiency

The Cooler Master V850 SFX Gold boasts a power output of 850W, making it a robust option for high-performance systems. In contrast, the JUSTOP provides 700W, which is adequate for many standard builds but may not suffice for more demanding hardware configurations.

Moreover, the V850 SFX Gold achieves an 80 PLUS Gold certification with 90% efficiency under typical loads, ensuring lower energy costs and reduced heat production. The JUSTOP, while functional, only offers around 70% efficiency, which can lead to higher energy usage and increased heat in your system. This distinction is critical for users prioritising both performance and energy savings.

Form Factor and Compatibility

The Cooler Master V850 SFX Gold is particularly well-suited for small form factor (SFF) cases, measuring just 100 x 125 x 63.5 mm. This compact design allows for installation in mini-ITX cases while still being compatible with ATX cases via an included SFX-to-ATX bracket.

On the other hand, the JUSTOP Black 700W power supply, with dimensions of 150mm x 85mm x 140mm, is built for standard ATX cases. This makes the JUSTOP less versatile for compact builds, which may be a deciding factor for those looking to save space or build a minimalist PC.

Cooling Solutions

Cooling is a vital aspect of any power supply, and both products approach this differently. The Cooler Master features a 92mm fluid dynamic bearing (FDB) fan designed to maintain a quiet operation while effectively managing heat. It also includes a semi-fanless mode, enabling silent performance under low loads.

Conversely, the JUSTOP utilises a larger 120mm quiet cooling fan, which may provide excellent airflow but does not offer the semi-fanless feature. While the JUSTOP's fan enhances cooling, it operates at 40dBA, which could be noticeable in quieter environments.

Cable Management and Modular Design

One of the standout features of the Cooler Master V850 SFX Gold is its fully modular cabling system. This design allows for streamlined cable management, reducing clutter and improving airflow within the case. Users can connect only the cables they need, which is particularly beneficial for sophisticated builds.

In contrast, the JUSTOP does not offer a modular design, which could lead to unnecessary cables cluttering the case. This difference may affect the overall aesthetic and airflow of a build, with the Cooler Master providing a clear advantage in terms of internal organisation.

Build Quality and Longevity

The Cooler Master V850 SFX Gold is built with high-quality components, including 100% Japanese capacitors, which contribute to its reliability and long lifespan. It is backed by a 10-year warranty, offering peace of mind for users investing in a high-performance power supply.

The JUSTOP, while featuring safety protections such as over voltage and short circuit protection, does not specify the same level of component quality. Although it serves well for general use, the absence of a lengthy warranty and details on capacitor quality could imply a shorter lifespan compared to the Cooler Master.

Safety Features

Safety is paramount in any power supply, and both products come equipped with essential protection mechanisms. The JUSTOP includes over voltage protection, over power protection, and thermal overload cut-off protection, ensuring that your components are safeguarded against unexpected surges.

Similarly, the Cooler Master features robust safety standards but places a stronger emphasis on efficiency and performance. The 80 PLUS Gold certification not only reflects its energy efficiency but also indicates a commitment to quality and safety in power delivery, making it a more reliable choice for high-performance systems.

Which should you buy?

Choosing between the Cooler Master V850 SFX Gold and the JUSTOP Black 700W Power Supply Unit ultimately depends on your specific needs and budget. The Cooler Master excels in performance, efficiency, and build quality, making it ideal for high-end, compact builds. However, it comes at a significantly higher price of £134.56.

The JUSTOP, with its lower price of £29.95, offers decent performance for standard ATX builds but lacks the advanced features and efficiency of the Cooler Master. If you're looking for a budget-friendly option for basic setups, the JUSTOP is a solid choice. However, for those prioritising performance, efficiency, and longevity, the Cooler Master V850 SFX Gold stands out as the superior option.