CORSAIR RM650e vs NZXT C850 SFX Gold - 850W SFX ATX 3.1 Power Supply - 80 Plus Gold - Cybenetics P

Price Comparison

The CORSAIR RM650e is priced at £71.57, while the NZXT C850 SFX Gold is significantly higher at £129.98. This £58.41 difference positions the CORSAIR unit as the more budget-friendly option for consumers seeking a power supply. While the NZXT boasts higher wattage and premium features, the cost-effectiveness of the RM650e cannot be overlooked, particularly for users who may not require the additional power or features of the NZXT model.

Power Output

In terms of power output, the NZXT C850 SFX Gold comes with a robust 850W rating, which is notably higher than the 650W offered by the CORSAIR RM650e. This makes the NZXT a more suitable choice for high-demand systems with powerful graphics cards. The additional 200W can be critical for users running multiple GPUs or high-performance components, providing peace of mind that the power supply can handle peak loads without issue.

Modular Design

Both power supplies feature modular designs, but they cater to different needs. The CORSAIR RM650e is a fully modular PSU, which allows users to connect only the cables necessary for their build, optimising cable management and airflow within the case. On the other hand, while the NZXT C850 SFX Gold is designed for compact builds with its SFX form factor, it does not specify if it is fully modular. This distinction may influence builders who prioritise spaciousness and organisation in their setups.

Efficiency Ratings

The efficiency ratings of these two power supplies also differ significantly. The NZXT C850 SFX Gold holds an impressive 80 PLUS Gold certification and a Cybenetics Platinum efficiency rating, which ensures reduced heat output and enhanced performance. In contrast, the CORSAIR RM650e is also Intel ATX 3.1 certified but does not specify an efficiency rating comparable to the NZXT. For users concerned about energy consumption and heat, the NZXT might offer better long-term savings and component protection.

Cooling Solutions

Cooling mechanisms are essential for maintaining system stability and longevity. The CORSAIR RM650e uses a 120mm rifle bearing fan designed to minimise noise even under full load. In contrast, the NZXT C850 SFX Gold features a 92mm fluid dynamic bearing (FDB) fan, which also includes a Zero RPM mode for silent operation. Although both designs aim for quiet performance, the larger fan size in the CORSAIR may offer better airflow in larger setups, while the NZXT’s silent operation mode may appeal to users prioritising a noiseless environment.

Compatibility

The compatibility of these power supplies is another crucial aspect to consider. The CORSAIR RM650e is compliant with the ATX 3.1 power standard, supporting PCIe 5.1, which is essential for newer graphics cards that demand higher power draw. Meanwhile, the NZXT C850 SFX Gold is designed specifically for compact builds and is also ATX 3.1 certified, meaning both units can support modern hardware. However, the SFX form factor of the NZXT may limit its compatibility with larger cases, making the CORSAIR a more versatile choice for various builds.

Build Quality and Components

When it comes to build quality, both power supplies promise reliable operation. The CORSAIR RM650e features 105°C-rated capacitors, which contribute to stable and dependable power delivery. The NZXT C850 SFX Gold, on the other hand, offers low ripple noise and tight voltage regulation, which are critical for protecting sensitive components in a system. While both units are designed with high-quality components, the specific focus on low ripple noise in the NZXT may provide an added layer of component protection, particularly in systems with high-performance demands.

Which should you buy?

Choosing between the CORSAIR RM650e and the NZXT C850 SFX Gold largely depends on your specific needs and budget. If you are looking for a more economical option that still delivers reliable power for standard builds, the CORSAIR RM650e at £71.57 is a strong contender. However, if you require higher wattage for demanding components and value quieter operation and premium efficiency, the NZXT C850 SFX Gold may justify its higher price of £129.98. Ultimately, both units have their strengths, making them suitable for different types of users.