CORSAIR SF850 vs CORSAIR RM1000e

Overview of the CORSAIR SF850 and CORSAIR RM1000e

The CORSAIR SF850 and CORSAIR RM1000e are both high-quality power supplies from Corsair, designed for efficiency and reliability. The SF850 is priced at £149.99, while the RM1000e is slightly cheaper at £149.88. Despite their similar price points, they offer distinct features that cater to different user needs.

Power Efficiency and Ratings

The CORSAIR SF850 boasts an 80 PLUS Platinum rating, indicating its high energy efficiency, particularly in small-form-factor PCs. This rating ensures that the power supply converts a significant amount of AC power into usable DC power, minimising waste. Conversely, the CORSAIR RM1000e is Intel ATX 3.1 certified, which guarantees compatibility with newer systems and supports PCIe 5.1. Though the RM1000e does not specify an efficiency rating like the SF850, its design is tailored for modern setups, making it efficient in its own right.

Form Factor and Compatibility

The SF850 is designed in a compact SFX form-factor, making it ideal for power-dense small-form-factor builds or for saving space in larger cases. This compact design is complemented by its fully modular Type-5 Micro-Fit PSU connectors, allowing for tidy cable management. In contrast, the RM1000e is a standard ATX power supply that, while also fully modular, may take up more space in smaller builds. Users with compact setups may find the SF850 to be the better choice due to its size.

Cooling Solutions

Cooling is critical for maintaining performance and longevity in power supplies. The CORSAIR SF850 features a 92mm PWM cooling fan designed for low-noise operation, utilising a fluid dynamic bearing for efficient airflow. This fan size is suitable for its compact form-factor. On the other hand, the RM1000e comes equipped with a larger 120mm rifle bearing fan, which is engineered to operate quietly, even under full load. The larger fan may provide better cooling efficiency, especially in larger cases.

Capacitor Quality and Reliability

Both power supplies are equipped with 105°C rated Japanese capacitors, indicating their ability to withstand higher temperatures and deliver reliable performance. The use of high-quality capacitors is crucial for ensuring steady voltage and minimising ripple, which can enhance the overall stability of a system. While both models share this feature, the reliability of power delivery may be perceived as slightly superior in the RM1000e due to its design focused on modern power demands.

Noise Levels

Noise levels can significantly impact the overall user experience, particularly in a quiet computing environment. The SF850 is designed for low-noise operation thanks to its 92mm fan, which operates quietly under load. In comparison, the RM1000e's 120mm fan is specifically calibrated for low noise, making it an excellent choice for users who prioritise a quiet system. The larger fan allows for a lower RPM at equivalent cooling performance, which can lead to a quieter operation overall.

Build Quality and Design

Both the CORSAIR SF850 and RM1000e reflect Corsair's commitment to quality and design. The SF850's compact design is ideal for small builds, while the RM1000e's sleek finish suits a range of system aesthetics. Both power supplies feature fully modular cabling, allowing users to connect only the cables they need, which helps reduce clutter inside the case. This feature enhances airflow and makes building or upgrading systems an easier task.

Which should you buy?

When deciding between the CORSAIR SF850 and RM1000e, consider your specific needs. If you're building a compact PC and prioritise space efficiency and high energy ratings, the SF850, with its 80 PLUS Platinum certification, is an excellent choice. However, if you require a power supply that supports modern standards and offers robust cooling with quieter operation, the RM1000e may be the better option. Both power supplies are reliable, but your choice will ultimately depend on your system's requirements and your preferences for form factor, noise levels, and cooling solutions.