CORSAIR SF850 vs Corsair HX1000i Fully Modular Ultra-Low Noise ATX Power Supply - ATX 3.1 & PCIe

Introduction to Power Supplies

When it comes to selecting a power supply, two standout options from Corsair are the CORSAIR SF850 and the Corsair HX1000i. Both power supplies are highly regarded for their performance and efficiency, but they cater to slightly different needs. The SF850 is priced at £149.99, while the HX1000i is available for £169.99. This article delves into their features, performance, and overall value to help you make an informed decision.

Design and Form Factor

The CORSAIR SF850 is designed in a compact SFX form-factor, making it ideal for small-form-factor PCs. Its small size does not compromise on power, offering 850 watts of Platinum-rated efficiency. In contrast, the Corsair HX1000i is an ATX power supply, which is generally larger and better suited for standard builds that require higher wattage. The HX1000i delivers 1000 watts, making it a more powerful option for users with demanding hardware setups. The choice between these designs largely depends on your build requirements and space constraints.

Efficiency and Ratings

Efficiency is a critical factor in power supply performance, and both models excel in this area. The CORSAIR SF850 boasts an 80 PLUS Platinum rating, ensuring that it operates with minimal energy loss. The HX1000i also holds an Intel ATX 3.1 certification, similar to the SF850, and supports the latest PCIe Gen 5.1 platform. While both power supplies resist transient power spikes effectively, the SF850's Platinum rating suggests it may provide slightly better energy efficiency in typical usage scenarios.

Cooling Solutions

Cooling performance significantly impacts the longevity and reliability of a power supply. The CORSAIR SF850 is equipped with a 92mm PWM cooling fan that operates quietly due to its fluid dynamic bearing design. On the other hand, the Corsair HX1000i features a larger 140mm Fluid Dynamic Bearing fan, which not only enhances airflow but also offers extremely quiet operation. Additionally, the HX1000i includes a Zero RPM Fan Mode, allowing the fan to switch off entirely at low and medium loads, further reducing noise. For users prioritising low noise levels, the HX1000i's features provide a distinct advantage.

Cable Management and Modularity

Both power supplies feature fully modular designs, which facilitate clean and efficient builds by allowing users to connect only the cables needed for their specific configuration. The CORSAIR SF850 employs Type-5 Micro-Fit PSU connectors, which can be especially beneficial in compact cases where space is at a premium. Conversely, the HX1000i's modularity is enhanced by its ability to integrate seamlessly with CORSAIR's iCUE software, enabling users to monitor power settings and adjust fan performance dynamically. If cable management and customisation are top priorities, the HX1000i offers greater versatility.

Software Integration

One of the standout aspects of the Corsair HX1000i is its compatibility with CORSAIR iCUE software. This powerful tool allows users to create custom fan curves, monitor real-time power settings, and toggle between single to multi-rail overcurrent protection on-the-fly. The CORSAIR SF850, while efficient and compact, does not offer any software integration options. For tech enthusiasts who value detailed monitoring and customisation, the HX1000i’s software capabilities are a significant advantage.

Price Comparison

Pricing is a crucial consideration for many buyers. The CORSAIR SF850 is priced at £149.99, making it the more budget-friendly option of the two. Meanwhile, the Corsair HX1000i comes in at £169.99, reflecting its higher wattage and additional features. While both products offer robust performance, the price difference may sway buyers depending on their budget constraints and specific power needs.

Which should you buy?

Choosing between the CORSAIR SF850 and the Corsair HX1000i ultimately hinges on your specific requirements. If you need a compact, efficient power supply for a small build, the SF850 is an excellent choice. However, if you require higher wattage and value advanced features like software integration and quieter operation, the HX1000i is worth the extra investment. Both power supplies are reliable, but understanding your needs will guide you to the best option for your setup.