CORSAIR RM850x Fully Modular Low-Noise ATX Power Supply vs JUSTOP Black 750W PSU

Price Comparison

When considering price, the JUSTOP Black 750W PSU is significantly more affordable at £32.95 compared to the CORSAIR RM850x, which is priced at £124.40. This represents a difference of £91.45, making the JUSTOP an attractive option for budget-conscious consumers. However, the pricing reflects not just the wattage but also the features and build quality of each power supply. While the JUSTOP offers a basic power supply solution, the higher cost of the CORSAIR RM850x is justified by its advanced capabilities and certifications.

Power Output

The power output of the products reveals a substantial difference, with the CORSAIR RM850x delivering an impressive 850W compared to the JUSTOP Black’s 750W capacity. This additional 100W may be crucial for high-performance systems, especially those equipped with the latest graphics cards. The CORSAIR’s compliance with ATX 3.1 standards further ensures its ability to handle transient power spikes, which can be particularly important for gaming and heavy computing tasks. Therefore, if you require a higher wattage for demanding applications, the CORSAIR is clearly the better choice.

Efficiency Ratings

In terms of efficiency, the CORSAIR RM850x holds a significant advantage with its Cybenetics Gold certification, rating up to 91% efficiency. This high level of efficiency not only reduces power consumption but also leads to cooler operating temperatures and lower noise levels. Conversely, while the JUSTOP Black does not specify an efficiency rating, it offers basic features such as Power Factor Control (PFC) and various protection mechanisms that aim to ensure a stable power output. For users prioritising energy efficiency and lower operational costs, the CORSAIR RM850x stands out as the superior option.

Build Quality and Design

The build quality and design of the power supplies differ noticeably, with the CORSAIR RM850x being fully modular. This feature allows users to connect only the cables necessary for their setup, resulting in a cleaner and more organised build. Its embossed cables with low-profile combs not only enhance aesthetics but also improve airflow within the case. In contrast, the JUSTOP Black offers a more traditional design with all standard connectors included, which may lead to a more cluttered interior if not managed properly. For those who value aesthetics and ease of installation, the CORSAIR RM850x is undoubtedly the more appealing choice.

Cooling Solutions

Cooling is a vital aspect of power supplies, and here the JUSTOP Black features a 120mm cooling fan, providing adequate cooling for its 750W output. However, the CORSAIR RM850x's design focuses on low noise levels, supported by its efficient cooling mechanisms, which may not be detailed but are essential for high-performance environments. The quieter operation of the CORSAIR is likely to be preferred in gaming or workstation setups, where noise levels can be a distraction. Hence, for users who prioritise a silent operation, the CORSAIR RM850x is the better option.

Safety and Protection Features

Safety features are crucial in power supplies, and both products offer a range of protective mechanisms. The JUSTOP Black includes over voltage protection, over power protection, short circuit protection, and thermal overload cut-off protection, ensuring safe operation under various conditions. On the other hand, while the CORSAIR RM850x doesn’t explicitly list its protective features, its high efficiency and quality design suggest robust internal protections are also in place. For those particularly concerned about safety, both units provide essential protections, but the CORSAIR’s build quality may inspire more confidence in demanding scenarios.

Compatibility and Connectivity

When it comes to compatibility and connectivity, the CORSAIR RM850x stands out with its native 12V-2x6 connector, which ensures direct compatibility with the latest graphics cards without the need for adapters. This feature is particularly important for gamers and professionals using high-end hardware. The JUSTOP Black, while offering standard connectors such as a 24-pin (20+4) and 8-pin (4+4), may not support the latest technologies as seamlessly as the CORSAIR. Therefore, for users looking to future-proof their systems, the CORSAIR RM850x is the clear winner.

Which should you buy?

In conclusion, choosing between the CORSAIR RM850x and the JUSTOP Black 750W PSU ultimately depends on your specific needs and budget. If you are looking for a cost-effective solution for a basic build, the JUSTOP Black offers a very affordable option at £32.95. However, for those seeking superior performance, efficiency, and features tailored for high-end systems, the CORSAIR RM850x, despite its higher price of £124.40, provides exceptional value. With its fully modular design, high efficiency, and advanced features, the CORSAIR RM850x is the better investment for serious gamers and PC builders.