NZXT C850 SFX Gold - 850W SFX ATX 3.1 Power Supply - 80 Plus Gold - Cybenetics P vs CORSAIR RM750e

Overview of the NZXT C850 SFX Gold and CORSAIR RM750e

The NZXT C850 SFX Gold is priced at £129.98, while the CORSAIR RM750e is significantly more affordable at £81.99. Both power supplies cater to different user needs, with the NZXT focusing on compact builds and high efficiency, while the Corsair offers a flexible modular design.

The NZXT C850 is designed specifically for small form factor (SFF) cases, making it an excellent choice for users looking to maximise space without sacrificing power. It boasts an 80 PLUS Gold certification, ensuring premium efficiency and quieter operation. In contrast, the CORSAIR RM750e, while also efficient with its Intel ATX 3.1 certification, highlights its fully modular design, allowing users to connect only the cables necessary for their specific builds, which can simplify installation and improve airflow.

Design and Form Factor

The NZXT C850 SFX Gold features a compact SFX form factor, optimised for smaller cases, which is ideal for users wanting to create a sleek, space-saving build. This design enables full power capabilities within a reduced footprint, making it a strong contender for mini-ITX setups.

On the other hand, the CORSAIR RM750e adheres to the standard ATX form factor, allowing it to fit comfortably in a wider range of cases. It is fully modular, which not only helps in optimising space but also enhances cable management. Users can connect only the required cables, reducing clutter and improving airflow within the case, which is an essential factor for maintaining system performance.

Efficiency Ratings

The efficiency ratings of both power supplies highlight their performance capabilities. The NZXT C850 SFX Gold is certified with an 80 PLUS Gold rating, which indicates high efficiency levels, ensuring that less energy is wasted as heat. This translates into both lower electricity bills and less thermal output, contributing to a quieter system due to reduced cooling requirements.

Meanwhile, the CORSAIR RM750e also boasts impressive efficiency, certified under the ATX 3.1 standard, which supports the latest hardware requirements, including the ability to handle 2x transient power excursions from modern GPUs. Although the exact efficiency rating isn't specified, its design ensures that it maintains reliable power delivery, making it a suitable choice for high-performance builds.

Cooling Solutions

Cooling solutions are crucial for maintaining optimal performance in power supplies. The NZXT C850 SFX Gold features a 92 mm fluid dynamic bearing (FDB) fan that operates quietly and efficiently. It includes a Zero RPM mode, allowing the fan to remain off during low loads, which significantly reduces noise in quieter environments.

Conversely, the CORSAIR RM750e utilises a 120 mm rifle bearing fan that is designed to keep noise levels down even under full load. The fan curve is specifically calculated to ensure that the fan operates at lower speeds whenever possible, thus providing a quieter experience. Both power supplies implement advanced cooling technologies aimed at prolonging their lifespan and maintaining system stability.

Power Delivery and Stability

Power delivery is a critical element in any power supply unit. The NZXT C850 SFX Gold includes a robust 600W 12V-2x6 connector, ensuring safe and dependable power delivery for modern graphics cards. This feature is particularly advantageous for gamers and content creators who rely on high-performance GPUs.

The CORSAIR RM750e, while delivering 750W of power, is also designed to provide stable and reliable performance. Its use of 105°C-rated capacitors ensures that even under high temperatures, the power supply can maintain its efficiency and reliability. This stability is crucial for users pushing their systems to the limits, making it an excellent choice for gamers and professionals alike.

Noise Levels and Operation

Noise levels can significantly affect user experience, especially in home or office environments. The NZXT C850 SFX Gold’s design prioritises quiet operation, boasting a Cybenetics A- noise rating. This indicates that the unit is designed to run quietly, thanks in part to its efficient fan design and low ripple noise, which contributes to a stable system performance.

In comparison, the CORSAIR RM750e also focuses on noise reduction with its specially calculated fan curve. While specific noise ratings are not provided, the design aims to keep fan noise to a minimum, even when the power supply is under full load. Users looking for a quiet system will find both options appealing, though the NZXT may have a slight edge in silent operation.

Price Point

The pricing difference between the two power supplies is notable. The NZXT C850 SFX Gold is priced at £129.98, which reflects its premium features and compact design tailored for small builds. This price point may be justified for users who require the specific advantages offered by its SFX form factor and high efficiency.

On the other hand, the CORSAIR RM750e is available at a more budget-friendly price of £81.99. This lower price makes it an attractive option for users seeking a reliable and efficient power supply without the need for compact features. For those building standard-sized systems, the RM750e provides excellent value for money with its modular design and robust performance.

Which should you buy?

Deciding between the NZXT C850 SFX Gold and the CORSAIR RM750e ultimately depends on your specific needs and system requirements. If you are building a compact system and prioritise high efficiency, low noise, and a design that optimises space, the NZXT C850 SFX Gold is the superior choice despite its higher price. However, if you are looking for a reliable, fully modular power supply that offers good performance at a lower price point, the CORSAIR RM750e is an excellent option that meets most standard system requirements. Both power supplies deliver exceptional quality, making them worthy contenders in the market.