CORSAIR SF850 vs CORSAIR RM650e

Introduction to Power Supplies

When selecting a power supply unit (PSU), it’s essential to consider both performance and price. In this comparison, we will examine the CORSAIR SF850 and the CORSAIR RM650e. The SF850 is priced at £149.99, while the RM650e is significantly more affordable at £71.57. Both models boast advanced features suitable for modern PCs, but their specifications cater to different needs and budgets.

Power Rating and Efficiency

The CORSAIR SF850 offers a robust 850 Watts of power, making it suitable for high-performance builds and power-hungry components. It is rated 80 PLUS Platinum, indicating exceptional energy efficiency, which translates to lower electricity bills and reduced heat output. In contrast, the CORSAIR RM650e provides a maximum output of 650 Watts and is certified as 80 PLUS Gold. While the RM650e is efficient, it does not match the SF850's power rating or efficiency level, making the SF850 a better choice for demanding systems.

Form Factor and Size

The form factor is crucial in determining compatibility with various PC builds. The CORSAIR SF850 is an SFX unit, which is compact and ideal for small-form-factor PCs, while the RM650e is a standard ATX-sized PSU. This means that the SF850 can fit into tighter spaces without compromising on performance, making it a superior option for those with limited room. However, the larger RM650e may be more suitable for traditional builds where space is less of a concern.

Modular Cabling

Both power supplies feature fully modular cabling, which facilitates a cleaner and more efficient build. The CORSAIR SF850 employs Type-5 Micro-Fit connectors, optimised for space-saving and tidy cable management, especially beneficial in compact cases. The RM650e also offers fully modular cabling, allowing users to connect only the wires necessary for their specific configurations. While both feature modular designs, the SF850's connectors may provide a slight edge in compact configurations.

Cooling Solutions

Effective cooling is vital for maintaining optimal performance in power supplies. The CORSAIR SF850 is equipped with a 92mm PWM cooling fan, designed for powerful yet low-noise operation, ensuring that it stays cool even under load. On the other hand, the CORSAIR RM650e utilises a 120mm rifle bearing fan, which is calculated to keep noise levels down, even when fully loaded. The larger fan in the RM650e may offer quieter operation during high demand, but the SF850's advanced cooling technology ensures reliable performance in tight spaces.

Component Quality

Both power supplies boast high-quality components, contributing to their reliability. The CORSAIR SF850 includes 105°C rated Japanese capacitors, which are known for their durability and performance under stress. Similarly, the RM650e also features 105°C rated capacitors, ensuring stable power delivery. While both units utilise top-notch components, the SF850’s higher power rating may put additional strain on its capacitors during peak loads, making its quality assurance particularly noteworthy.

Compliance and Compatibility

The CORSAIR SF850 and RM650e are both compliant with the Intel ATX 3.1 standard and support the PCIe 5.1 platform, ensuring compatibility with the latest hardware. This is crucial for gamers and professionals looking to future-proof their systems. However, the SF850 is specifically designed to handle transient power spikes better, which is essential for high-performance GPUs that demand quick bursts of power. The RM650e can withstand 2x transient power excursions but may not be as robust in extreme scenarios.

Pricing and Value Proposition

In terms of pricing, the CORSAIR SF850 is significantly more expensive at £149.99 compared to the RM650e's £71.57. While the SF850 offers higher wattage and efficiency, the RM650e presents a compelling value for those who do not require the additional power. For budget-conscious consumers or those with mid-range builds, the RM650e delivers excellent performance without breaking the bank. However, for enthusiasts looking for maximum performance and efficiency, the SF850 justifies its higher price.

Which should you buy?

Choosing between the CORSAIR SF850 and the CORSAIR RM650e ultimately depends on your specific needs and budget. If you require a high-power, efficient PSU for a demanding build, the SF850 is the clear winner with its 850 Watts and Platinum rating. Conversely, if you are looking for a reliable and more affordable option for a mid-range system, the RM650e provides excellent value at £71.57. Assess your requirements carefully to determine which PSU aligns best with your build.