CORSAIR RM850e vs CORSAIR SF850

Overview of the Power Supplies

When comparing the CORSAIR RM850e and the CORSAIR SF850, it is essential to note the distinct market segments they serve. The RM850e is priced at C$184.99, making it a more budget-friendly option for standard power needs, while the SF850, at C$279.99, targets those seeking high-performance capabilities in compact environments. Understanding these differences can help consumers choose the right power supply based on their specific requirements.

Design and Form Factor

The CORSAIR RM850e features a standard ATX form factor, making it suitable for most builds and offering reliable performance with fully modular cabling. In contrast, the CORSAIR SF850 is designed as an SFX power supply, catering specifically to small form-factor PCs. This compact design allows the SF850 to fit in tighter spaces, which is ideal for users prioritizing space-saving in their setups. The difference in form factor is crucial for builders to consider, as it directly impacts compatibility with various cases.

Efficiency Ratings

Efficiency is a critical factor for power supplies, and both the RM850e and SF850 stand out in this regard. The RM850e is compliant with the ATX 3.1 power standard, ensuring high efficiency and performance under various loads. On the other hand, the SF850 boasts an 80 PLUS Platinum rating, indicating that it is among the most efficient power supplies available, with minimal energy loss. The SF850's higher efficiency rating may result in lower energy bills and potentially quieter operation due to less heat generation.

Cooling Solutions

In terms of cooling, the RM850e is equipped with a 120mm rifle bearing fan, designed to operate quietly even under full load, which is a significant advantage for users seeking a low-noise experience. Conversely, the SF850 features a 92mm PWM cooling fan that utilises a fluid dynamic bearing for efficient cooling while maintaining a low noise level. While both power supplies aim for quiet operation, the size of the fans and their designs reflect their different cooling approaches suited to their respective form factors.

Capacitor Quality and Reliability

Both power supplies utilise high-quality capacitors, which is critical for maintaining stable power delivery and reliability. The RM850e includes 105°C-rated capacitors, ensuring dependable electrical performance for various system loads. Similarly, the SF850 also incorporates 105°C-rated Japanese capacitors, known for their reliability. This similarity in capacitor quality suggests that both power supplies are designed to withstand high temperatures and ensure longevity, making them both robust options for users.

Modular Cabling and Installation

The modularity of a power supply significantly affects installation ease and cable management. The RM850e is fully modular, allowing users to connect only the cables they need for their system, which can lead to a cleaner build and improved airflow. The SF850 also features fully modular cabling with Type-5 Micro-Fit PSU connectors, specifically designed for compact installations. This flexibility in both models means that users can achieve tidy cable management, but the SF850’s design is particularly advantageous for small case builds.

Compatibility and Future-Proofing

Compatibility with modern components is vital for any power supply, especially as technology continues to evolve. The RM850e supports PCIe 5.1 and is compliant with the latest ATX 3.1 standard, making it a future-proof option for users looking to build a system with the latest GPUs. The SF850, while also ATX 3.0 compliant and PCIe 5.0 ready, ensures that it can handle transient power spikes effectively. Both models are built to support high-end components, but the RM850e offers slightly better future-proofing with its newer ATX standard.

Which should you buy?

Choosing between the CORSAIR RM850e and the CORSAIR SF850 ultimately depends on your specific needs and budget. If you require a reliable, cost-effective power supply for a standard build, the RM850e at C$184.99 provides excellent value and efficiency with a robust design. However, if you are building a compact system and need a high-performance power supply, the SF850's SFX form factor and 80 PLUS Platinum efficiency, albeit at a higher price of C$279.99, make it an exceptional choice for those prioritising performance and space management. In summary, both power supplies have their merits, making the decision largely dependent on your individual requirements and system specifications.