CORSAIR RM850x Fully Modular Low-Noise ATX Power Supply vs JUSTOP Black 650W PSU

Overview of the Products

In this comparison, we will examine the CORSAIR RM850x Fully Modular Low-Noise ATX Power Supply and the JUSTOP Black 650W PSU. The CORSAIR RM850x is priced at £124.40, while the JUSTOP PSU is significantly more affordable at £29.99. Despite the price difference, each power supply offers unique features tailored to different user needs.

Build Quality and Design

The CORSAIR RM850x boasts a fully modular design, allowing users to connect only the cables necessary for their system, which reduces clutter and improves airflow. Its embossed cables with low-profile combs not only enhance aesthetics but also make installation easier. On the other hand, the JUSTOP Black 650W PSU features a standard design with a single 8-pin 12V rail for stable power output. While it includes a 120mm cooling fan for efficient heat management, its overall build quality may not match the premium feel and performance of the RM850x.

Efficiency and Certification

When it comes to efficiency, the CORSAIR RM850x is Cybenetics Gold-Certified, achieving up to 91% efficiency. This high rating translates to lower power consumption, reduced noise, and cooler operating temperatures which is crucial for high-performance builds. In contrast, the JUSTOP Black 650W PSU does not specify an efficiency rating, but it does offer essential protections such as over voltage and thermal overload cut-off. This could indicate that while the JUSTOP is safer, it may not be as efficient as the RM850x.

Compatibility and Standards

The CORSAIR RM850x is compliant with the ATX 3.1 power standard, making it compatible with the latest components, including PCIe 5.1. It features a native 12V-2x6 connector, ensuring a direct connection to modern graphics cards without the need for adapters. Meanwhile, the JUSTOP PSU, while versatile with its array of connectors, does not mention compatibility with the latest standards. This could limit its utility for users looking to build a future-proof system.

Cooling Solutions

Cooling is a vital aspect of any power supply, especially for high-performance systems. The CORSAIR RM850x utilises a low-noise design, which is ideal for users who prioritise a quiet operation during demanding tasks. The JUSTOP Black 650W PSU, on the other hand, features a 120mm cooling fan to keep temperatures in check. While it provides adequate cooling, it may not match the noise reduction capabilities of the RM850x, potentially leading to a noisier environment under load.

Safety Features

Safety is paramount in power supply design, and both the CORSAIR RM850x and the JUSTOP Black 650W PSU offer important protective measures. The RM850x includes multiple safety features, though specific details are not provided in the data. The JUSTOP model explicitly highlights its over voltage protection, over power protection, short circuit protection, and thermal overload cut-off protection, all of which are essential for preventing hardware damage. While both units provide safety, the explicit protections of the JUSTOP may appeal more to budget-conscious users.

Price Comparison

The price difference between the two power supplies is significant, with the CORSAIR RM850x retailing at £124.40 and the JUSTOP Black 650W PSU at just £29.99. This price disparity reflects the differences in features, build quality, and performance. The RM850x is aimed at enthusiasts who demand high efficiency, modularity, and compatibility with the latest technology. In contrast, the JUSTOP PSU offers a budget-friendly option for users with basic power requirements and less demanding systems.

Which should you buy?

Ultimately, the choice between the CORSAIR RM850x Fully Modular Low-Noise ATX Power Supply and the JUSTOP Black 650W PSU hinges on your specific needs and budget. If you require a high-performance, efficient, and future-proof power supply, the CORSAIR RM850x is the clear winner, despite its higher price. However, for users on a tight budget who need a basic power supply with essential safety features, the JUSTOP Black 650W PSU presents an attractive option.