CORSAIR SF850 vs Corsair RM850e

Introduction to the Corsair SF850 and RM850e

When it comes to power supplies, the Corsair SF850 and Corsair RM850e are two compelling options, each with distinct features and price points. The SF850 is positioned at £149.99, while the RM850e is more budget-friendly at £92.99. This comparison will delve into their specifications, performance, and suitability for different builds, helping you make an informed decision.

Design and Form Factor

The Corsair SF850 boasts a compact SFX form factor, making it ideal for small-form-factor builds where space is at a premium. In contrast, the RM850e follows a standard ATX design, which is suitable for a wider range of cases. The SF850's compactness allows for flexibility in tighter spaces without compromising on power. On the other hand, the RM850e's larger size can accommodate more traditional setups, offering a straightforward installation process.

Power Ratings and Efficiency

In terms of power ratings, the Corsair SF850 is an 850W power supply with an 80 PLUS Platinum certification, ensuring high efficiency and minimal energy waste. The RM850e also delivers 850W but comes with an Intel ATX 3.1 certification, ensuring it meets modern power requirements. While both units provide ample power for demanding builds, the SF850's Platinum rating indicates superior efficiency, which can be particularly beneficial for users looking to optimise their energy consumption.

Cooling Solutions

Cooling is a crucial aspect of any power supply, and here both models take different approaches. The SF850 is equipped with a 92mm PWM cooling fan that operates quietly due to its fluid dynamic bearing, ensuring effective cooling without excessive noise. Meanwhile, the RM850e features a 120mm rifle bearing fan, which is designed to keep noise levels low even under full load. While both fans aim to minimise noise, the size difference may impact cooling performance in high-demand situations, with the RM850e potentially providing better airflow due to its larger fan.

Modular Cabling

Both the Corsair SF850 and RM850e feature fully modular cabling, allowing users to connect only the cables necessary for their specific build. This not only aids in cable management but also enhances airflow within the case. The SF850 uses Type-5 Micro-Fit PSU connectors, which are designed to take up less space and assist in maintaining a tidy setup. Conversely, the RM850e's modular system is straightforward and efficient, catering to a variety of system builds without unnecessary clutter.

Capacitor Quality and Reliability

When it comes to reliability, both power supplies feature 105°C rated capacitors, which are crucial for consistent performance and longevity. The use of high-quality Japanese capacitors in the SF850 ensures unwavering power delivery, while the RM850e also promises dependable electrical performance. This similarity indicates that both units are built to withstand demanding conditions, making them reliable choices for users seeking long-lasting performance.

Noise Levels and Operation

Noise levels can significantly affect user experience, especially in quiet environments. The Corsair SF850, with its smaller 92mm fan, is engineered for low-noise operation, making it particularly attractive to users prioritising silence. In comparison, the RM850e’s 120mm fan is designed with a specially calculated fan curve to minimise noise, even at full load. While both models aim for quiet operation, the SF850's design may have a slight edge in ultra-quiet setups, particularly in compact builds where noise can be more pronounced.

Pricing and Value

Price is often a decisive factor when choosing a power supply. The Corsair SF850 is priced at £149.99, making it a more premium option compared to the Corsair RM850e, which retails for £92.99. The higher price of the SF850 can be justified by its Platinum efficiency rating and compact design. However, for users on a tighter budget or those who do not require the highest efficiency rating, the RM850e provides excellent value with its reliable performance and modern certifications.

Which should you buy?

Deciding between the Corsair SF850 and RM850e ultimately depends on your specific needs and budget. If you require a compact, high-efficiency power supply for a small-form-factor build and are willing to invest a bit more, the SF850 is the superior choice with its Platinum rating and advanced cooling solutions. However, if you are looking for a reliable, cost-effective option for a standard build, the RM850e is an excellent alternative, offering solid performance and modern features at a more accessible price point.