CORSAIR RM850x Fully Modular Low-Noise ATX Power Supply vs NZXT C850 SFX Gold - 850W SFX ATX 3.1 Power Supply - 80 Plus Gold - Cybenetics P

Overview of the Power Supplies

When considering the CORSAIR RM850x and the NZXT C850 SFX Gold, both power supplies cater to high-performance systems, but they target slightly different user needs. The CORSAIR RM850x is priced at £124.40, while the NZXT C850 is slightly more expensive at £129.98. Each power supply boasts unique features that may appeal to different types of builds and preferences.

Efficiency Ratings

Efficiency is a crucial factor in power supply selection, and both the CORSAIR RM850x and NZXT C850 SFX Gold excel in this area. The CORSAIR RM850x is Cybenetics Gold-Certified, achieving up to 91% efficiency. This high efficiency translates to reduced power consumption and cooler operating temperatures, which can enhance the longevity of your components. Meanwhile, the NZXT C850 boasts an 80 PLUS Gold rating alongside a Cybenetics Platinum efficiency certification. This ensures that both units operate effectively, but the NZXT may offer slightly better performance in reducing heat output due to its dual certification.

Form Factor

The form factor of a power supply can greatly impact its compatibility with various builds. The CORSAIR RM850x adopts the standard ATX form factor, making it suitable for a wide range of cases. In contrast, the NZXT C850 is designed as an SFX unit, optimising space for compact builds. This SFX form factor allows the NZXT C850 to fit snugly into smaller cases without compromising performance, which can be a decisive factor for users with space constraints.

Modularity

Both power supplies offer modular cabling, but they approach it differently. The CORSAIR RM850x features fully modular cabling, allowing users to connect only the cables their system requires. This not only simplifies installation but also improves airflow within the case. On the other hand, while the NZXT C850 also supports modular connections, it is specifically designed for compact builds, ensuring that even with reduced space, the installation remains efficient and neat. This feature could appeal to users who prioritise cable management in limited spaces.

Compatibility with Modern Hardware

For users building systems with the latest graphics cards, compatibility is paramount. The CORSAIR RM850x is ATX 3.1 compliant and includes a native 12V-2x6 connector, ensuring direct compatibility with modern GPUs without the need for adapters. Similarly, the NZXT C850 also meets ATX 3.1 certification and provides a reliable 600W 12V-2x6 connector. Both power supplies are well-equipped to handle the power demands of current hardware, providing users with the confidence that their components will operate safely and efficiently.

Noise Levels

Noise performance is another critical consideration for many builders. The CORSAIR RM850x is noted for its low-noise operation, which is particularly appealing for users who value a quiet computing environment. The NZXT C850 takes this a step further by featuring a fluid dynamic bearing (FDB) fan that operates in Zero RPM mode, ensuring silent operation during low loads. This can be a significant advantage for users who prefer a whisper-quiet system, especially in home or office environments.

Cooling Solutions

Effective cooling is essential for the longevity and stability of a system. The CORSAIR RM850x's design promotes efficient airflow, aided by its low-noise operation. However, the NZXT C850's 92 mm FDB fan not only provides cooling but does so quietly, reducing heat output without adding noise. The NZXT’s cooling capabilities, combined with its low ripple noise and tight voltage regulation, make it a strong contender for users prioritising thermal management in compact builds.

Which should you buy?

Choosing between the CORSAIR RM850x and the NZXT C850 SFX Gold ultimately depends on your specific needs. If you are looking for a standard ATX power supply with a focus on efficiency and low noise, the CORSAIR RM850x at £124.40 is an excellent choice. However, if you require a compact power supply that doesn’t sacrifice performance for size, the NZXT C850 at £129.98 may be the better option with its SFX form factor and advanced cooling features. Both are solid choices for high-performance systems, yet they cater to different preferences and requirements in the power supply market.