NZXT C850 SFX Gold - 850W SFX ATX 3.1 Power Supply - 80 Plus Gold - Cybenetics P vs JUSTOP Black 700W Power Supply Unit ATX PSU With 120MM Quiet Fan

Overview of the NZXT C850 SFX Gold and JUSTOP Black 700W Power Supply

When considering power supplies, the NZXT C850 SFX Gold and the JUSTOP Black 700W offer distinct features aimed at different user needs. Priced at £129.98, the NZXT C850 is designed for compact builds with a focus on high efficiency, while the JUSTOP Black, more budget-friendly at £29.95, caters to general users seeking reliable power without the premium features.

The NZXT C850 SFX Gold stands out with its 850W capacity and 80 Plus Gold certification, ensuring high efficiency and less heat output. In contrast, the JUSTOP Black offers 700W and operates at around 70% efficiency, making it suitable for basic setups but lacking the advanced specifications of its competitor.

Design and Form Factor

The NZXT C850 SFX Gold is specifically engineered for compact builds, utilising an SFX form factor that maximises space efficiency. This makes it ideal for small form factor (SFF) cases, ensuring that users can fit powerful components into limited spaces.

On the other hand, the JUSTOP Black is designed in the ATX format, which is standard for most desktop PCs. While ATX power supplies can generally fit in larger cases, they may not be as space-efficient as the NZXT model. If your build is constrained by size, the NZXT C850 is the better choice for maintaining a tidy and efficient setup.

Power Output and Efficiency

Power output is a significant factor when comparing these two models. The NZXT C850 delivers a robust 850W, making it suitable for high-performance systems that may include power-hungry graphics cards. Its 80 Plus Gold certification signifies that it operates at over 90% efficiency at typical loads, which means less wasted energy and lower heat generation.

In contrast, the JUSTOP Black offers a lower maximum output of 700W, which may suffice for basic gaming or office setups but could limit performance in demanding scenarios. With an efficiency rating of approximately 70%, it will generate more heat and consume more power compared to the NZXT C850, especially under load.

Cooling Solutions

Cooling performance is a critical consideration for any power supply. The NZXT C850 features a 92 mm fluid dynamic bearing (FDB) fan that not only provides effective cooling but also operates quietly with a Zero RPM mode. This means the fan only activates under load, leading to a more serene computing experience.

The JUSTOP Black, equipped with a 120 mm cooling fan, also prioritises quiet operation, but there are no specific noise ratings provided. While the larger fan may provide decent airflow, the NZXT’s advanced fan technology is designed for both efficiency and silence, making it a superior choice for noise-sensitive environments.

Protection Features

In terms of safety and protection, both power supplies come with essential features to safeguard your components. The NZXT C850 includes low ripple noise, tight voltage regulation, and long hold-up time, which help ensure uninterrupted system performance and protect against power fluctuations.

Conversely, the JUSTOP Black boasts several protection features such as over voltage protection, over power protection, short circuit protection, and thermal overload cut-off protection. While these are crucial for any power supply, the NZXT C850’s focus on low ripple and voltage stability is indicative of its premium positioning and reliability during intensive use.

Connector Options

Connector availability is crucial for compatibility with various components. The NZXT C850 comes with a 600W 12V-2x6 connector, specifically designed for modern graphics cards, along with other essential connectors that cater to the latest hardware requirements.

The JUSTOP Black offers a variety of connections, including a 24 pin (535mm), 8 pin 12V (545mm), and numerous SATA and Molex connectors. While it covers basic connectivity needs adequately, it may not support the latest graphics cards as effectively as the NZXT C850. Users with high-end components may find the NZXT’s offerings more suitable for their advanced setups.

Target Audience

The NZXT C850 SFX Gold is aimed at enthusiasts and gamers who require a powerful, efficient, and compact power supply to maximise performance in small builds. Its premium features and higher price point reflect its target audience of serious users who value reliability and efficiency.

On the other hand, the JUSTOP Black appeals to casual users or system integrators looking for a cost-effective solution for standard desktop builds. Its lower price point makes it an attractive option for users who may not need the advanced features of the NZXT model, thus catering to a different segment of the market.

Which should you buy?

In conclusion, the choice between the NZXT C850 SFX Gold and JUSTOP Black 700W power supplies largely depends on your specific needs and budget. If you require a high-output, efficient, and compact power supply for a performance-oriented build, the NZXT C850 at £129.98 is the superior option. However, for basic systems where cost is a primary concern, the JUSTOP Black at £29.95 provides a reliable, albeit less advanced, solution. Ultimately, your choice should reflect the demands of your system and your willingness to invest in premium features.