CORSAIR RM850e vs CORSAIR SF850

Introduction to Power Supplies

When choosing a power supply unit (PSU), the CORSAIR RM850e and the CORSAIR SF850 stand out as two strong contenders. With prices at £85.99 and £149.99 respectively, each offers distinct features tailored for different build requirements and preferences. Understanding the nuances between these two models can help you make an informed decision based on your specific needs.

Power Output and Efficiency

The CORSAIR RM850e provides a reliable 850 watts of power while maintaining a low noise profile. It is compliant with the ATX 3.1 standard, ensuring it can handle transient power spikes effectively. In contrast, the CORSAIR SF850 also delivers 850 watts but boasts an 80 PLUS Platinum rating, indicating higher efficiency compared to standard models. This could mean lower electricity bills over time. While both units are designed for demanding systems, the SF850’s efficiency rating might appeal more to users looking for optimal performance in energy consumption.

Form Factor and Compatibility

The form factor is a crucial consideration for many builders. The CORSAIR RM850e follows the standard ATX size, making it suitable for most cases, providing ample space for installation. On the other hand, the CORSAIR SF850 is designed in a compact SFX form factor, ideal for small-form-factor PCs. This feature allows it to fit seamlessly into tighter spaces without compromising on power. Therefore, if you are working with a smaller case, the SF850 would be the better choice, while the RM850e offers broader compatibility for standard builds.

Modular Cabling

Both the RM850e and the SF850 offer fully modular cabling, allowing users to connect only the necessary cables for their system. This design not only enhances ease of installation but also promotes better cable management. The RM850e’s modular connections are straightforward for standard setups, while the SF850 features Type-5 Micro-Fit connectors, reducing cable bulk in small cases. This difference may sway users who prioritise a clean build aesthetic, especially in compact environments.

Cooling Solutions

Cooling is essential in maintaining efficient PSU performance. The CORSAIR RM850e incorporates a 120mm rifle bearing fan, designed to operate quietly even under full load, ensuring a serene computing experience. Conversely, the SF850 is equipped with a 92mm PWM cooling fan that utilises fluid dynamic bearings, promising effective cooling with minimal noise. While both units focus on quiet operation, the larger fan in the RM850e may offer slightly better cooling capacity under stress, although both designs are engineered for low-noise performance.

Component Quality and Durability

Durability is paramount in power supplies, and both the RM850e and the SF850 boast high-quality components. The RM850e features 105°C-rated capacitors, ensuring stable and reliable power delivery. The SF850 matches this with its own 105°C rated Japanese capacitors, enhancing its reputation for reliability. The choice between the two may come down to brand preference, but both are engineered to deliver dependable performance over their lifespans.

Noise Levels

Noise levels play a significant role in user experience, especially for those who value a quiet workspace. The RM850e, with its 120mm fan, has been designed to minimise noise even under peak loads, making it suitable for builds where silence is golden. The SF850 also focuses on quiet operation with its 92mm fan, utilising advanced bearing technology to further reduce noise. Ultimately, users can expect both PSUs to perform quietly, but the RM850e might have a slight edge in noise reduction due to its larger fan size.

Which should you buy?

Choosing between the CORSAIR RM850e and the CORSAIR SF850 largely depends on your specific needs and budget. If you are looking for a cost-effective solution with excellent reliability and silent operation, the RM850e at £85.99 stands out. However, if you're building a compact system where space-saving is crucial and you desire top-tier efficiency, the SF850 at £149.99 offers a compelling choice with its SFX form factor and Platinum rating. Ultimately, both power supplies are designed to deliver high performance, but your decision should align with your build requirements and budget preferences.