JUSTOP Black 650W PSU vs NZXT C850 SFX Gold - 850W SFX ATX 3.1 Power Supply - 80 Plus Gold - Cybenetics P

Price Comparison

The JUSTOP Black 650W PSU is significantly more affordable at £29.99 compared to the NZXT C850 SFX Gold, which is priced at £129.98. This substantial difference of £100 in price may appeal to budget-conscious consumers who need a reliable power supply without breaking the bank. While both power supplies serve the same fundamental purpose, the price disparity may influence your decision based on the features offered and your specific needs.

Power Output

In terms of power output, the NZXT C850 SFX Gold stands out with a robust 850W capacity, compared to the 650W offered by the JUSTOP Black PSU. The higher wattage of the NZXT model allows for more headroom when powering high-performance components, particularly modern graphics cards, making it a strong choice for users planning to build or upgrade to a system requiring more power. This difference of 200W can be crucial for gamers or professionals using demanding applications.

Efficiency Ratings

The efficiency of a power supply significantly impacts its performance and longevity. The NZXT C850 SFX Gold boasts an 80 PLUS Gold certification, indicating that it operates at a minimum of 87% efficiency under typical loads. On the other hand, the efficiency rating for the JUSTOP Black PSU is not specified, which may suggest a lower efficiency compared to its competitor. Higher efficiency can lead to less wasted energy as heat, thereby optimising your system’s overall performance and lowering electricity costs in the long run.

Form Factor

The NZXT C850 SFX Gold is designed in an SFX form factor, which is ideal for compact builds where space is at a premium. This design allows it to deliver full-power capabilities while fitting into smaller cases, making it an excellent choice for users looking to build a small form factor (SFF) system. Conversely, the JUSTOP Black PSU follows the standard ATX form factor, which may limit its compatibility with more compact builds but offers ease of installation in larger cases.

Cooling Solutions

Cooling mechanisms are crucial for maintaining system stability and longevity. The NZXT C850 SFX Gold features a 92 mm fluid dynamic bearing (FDB) fan, which is known for its durability and efficiency. This fan includes a Zero RPM mode for silent operation, ensuring minimal noise during low loads. In comparison, the JUSTOP Black PSU utilises a 120mm cooling fan. While it provides adequate cooling, it may not be as quiet or efficient as the NZXT’s advanced fan technology, especially under varying loads.

Protection Features

Both power supplies incorporate safety features to protect your system. The JUSTOP Black PSU includes over voltage protection, over power protection, short circuit protection, and thermal overload cut-off protection, ensuring safe operation. The NZXT C850 SFX Gold also focuses on reliability with low ripple noise, tight voltage regulation, and long hold-up time, which are essential for maintaining system stability. While both units offer protection, the NZXT’s additional certifications could suggest a more robust approach to component safety.

Target Audience

The target audience for these power supplies varies significantly. The JUSTOP Black 650W PSU is aimed at budget-conscious users or those with less demanding power needs, making it suitable for general desktop PCs. In contrast, the NZXT C850 SFX Gold is tailored for enthusiasts and gamers who require reliable power for high-performance components. The choice between these two products ultimately hinges on your specific requirements, such as budget constraints and performance demands.

Which should you buy?

The decision between the JUSTOP Black 650W PSU and the NZXT C850 SFX Gold will largely depend on your individual needs and budget. If affordability is your top priority and you require a basic power supply for a standard desktop setup, the JUSTOP Black PSU is a solid choice at £29.99. However, if you are building a compact, high-performance system and require a more powerful and efficient solution, the NZXT C850 SFX Gold, at £129.98, offers significant advantages in terms of power output, efficiency, and cooling performance. Ultimately, consider what aspects are most crucial for your build when making your selection.