CORSAIR RM850x Fully Modular Low-Noise ATX Power Supply vs JUSTOP Black 700W Power Supply Unit ATX PSU With 120MM Quiet Fan

Price Comparison

When it comes to price, the CORSAIR RM850x is significantly more expensive than the JUSTOP Black 700W. The CORSAIR unit retails for £124.40, while the JUSTOP is priced at a mere £29.95. This stark difference of £94.45 raises questions about the features and performance one can expect at each price point. While the JUSTOP offers a budget-friendly option, the higher price of the CORSAIR suggests it might deliver better reliability and efficiency, which are crucial for high-performance systems.

Power Output

The power output of a power supply is essential for system stability, especially under load. The CORSAIR RM850x provides a robust 850W, which is well-suited for high-end gaming rigs or systems with multiple graphic cards. In comparison, the JUSTOP Black 700W offers a lower output at 700W. While 700W is sufficient for many mid-range builds, those looking to push the limits of their systems may find the additional 150W from the CORSAIR to be a significant advantage.

Efficiency Ratings

Efficiency is a critical factor in power supplies, affecting both performance and energy consumption. The CORSAIR RM850x boasts a Cybenetics Gold certification, indicating it operates at up to 91% efficiency. This high efficiency translates to lower power bills and reduced heat output. Conversely, the JUSTOP Black 700W is rated for 70% efficiency. This notable gap in efficiency standards suggests that the CORSAIR model not only provides better performance but also contributes to a more environmentally friendly setup.

Modular Design

Modularity in power supplies offers flexibility in cable management and system aesthetics. The CORSAIR RM850x features a fully modular design, allowing users to connect only the cables necessary for their system, thus reducing clutter and improving airflow. On the other hand, the JUSTOP Black 700W does not mention a modular design, which typically means all cables are permanently attached. This could result in a more cumbersome installation and a less tidy appearance in the case.

Cooling Solutions

Effective cooling is vital for maintaining optimal performance and longevity of components. The CORSAIR RM850x includes embossed cables designed for low-profile connections, which can aid in airflow and cooling. Additionally, while the specific cooling technology of the RM850x isn’t detailed, its reputation suggests advanced thermal management. The JUSTOP Black 700W, however, features a 120mm quiet cooling fan designed to keep temperatures down while minimising noise. While both models focus on cooling, the advanced features of the CORSAIR suggest superior thermal performance.

Protection Features

Safety features in power supplies are crucial for protecting both the unit and connected components. The CORSAIR RM850x is compliant with the ATX 3.1 standard and includes a native 12V-2x6 connector for compatibility with the latest graphics cards. The JUSTOP Black 700W, while offering several protections such as over voltage, over power, and short circuit protection, does not specify compliance with newer standards. Although both units provide essential protections, the CORSAIR’s advanced features indicate a higher level of safety and reliability.

Brand Reputation

Brand reputation can significantly influence purchasing decisions. Corsair is widely recognised for producing high-quality, high-performance components, particularly in the gaming and enthusiast markets. The CORSAIR RM850x is well-reviewed and trusted among gamers and PC builders. JUSTOP, on the other hand, is positioned more as a budget brand. While this does not inherently imply poor quality, those seeking top-tier performance may lean towards the trusted reputation of Corsair over the more economical offering from JUSTOP.

Which should you buy?

Ultimately, the choice between the CORSAIR RM850x and the JUSTOP Black 700W hinges on your specific needs and budget. If you are building a high-performance system that demands reliability, efficiency, and modularity, the CORSAIR RM850x is the clear winner at £124.40, offering superior power output, efficiency, and safety features. However, for those on a strict budget or building a less demanding system, the JUSTOP Black 700W at £29.95 can serve adequately. Thus, your decision should reflect your performance requirements and financial constraints.