CORSAIR SF850 vs CORSAIR HX1500i

Overview of the Corsair SF850 and Corsair HX1500i

The Corsair SF850 and Corsair HX1500i are two high-performance power supplies designed for different user needs. The SF850 is priced at £149.99, while the HX1500i is more expensive at £229.00. Both models comply with the ATX 3.1 power standard, but they cater to distinct market segments based on their power output and features.

The SF850 is ideal for small-form-factor builds, providing an 850W output in a compact SFX form-factor. In contrast, the HX1500i is designed for high-performance systems, offering a robust 1500W output suitable for more demanding setups. This comparison will explore each power supply's features, performance, and suitability for various uses.

Design and Form Factor

The design and form factor of a power supply can significantly influence its installation and overall system aesthetics. The Corsair SF850 features a compact SFX design, making it an excellent choice for small cases or systems where space is at a premium. Its 80 PLUS Platinum rating ensures high efficiency in a small footprint.

On the other hand, the Corsair HX1500i has a larger ATX form factor, which is more standard in high-performance builds. While it may not fit in the smallest cases, its design allows for improved airflow and cooling capabilities. Users should consider their case size and layout when choosing between these two models, as form factor can affect cable management and overall build quality.

Power Output and Efficiency

Power output is a crucial factor when selecting a power supply, and here the Corsair HX1500i has a clear advantage. With a maximum output of 1500W, it is designed to support high-end components, making it suitable for gaming rigs or workstations that require substantial power. In contrast, the SF850 offers 850W, which is adequate for most mid-range systems but may fall short for heavily overclocked setups or multi-GPU configurations.

Both power supplies boast an 80 PLUS Platinum efficiency rating, meaning they operate at over 90% efficiency at typical loads. This ensures that users get the most out of their energy consumption, which is particularly important for long gaming sessions or intensive computing tasks.

Cooling Solutions

Effective cooling is essential for maintaining optimal performance and longevity in power supplies. The Corsair SF850 features a 92mm PWM cooling fan, which balances cooling performance with noise levels. This fan operates quietly while providing sufficient airflow to keep the unit cool during operation.

In comparison, the Corsair HX1500i employs a larger 140mm fluid dynamic bearing fan. This fan not only enhances cooling efficiency but also contributes to quieter operation, especially under load. Additionally, the HX1500i includes a Zero RPM Fan Mode, allowing the fan to switch off entirely at low and medium loads, resulting in near-silent operation. For users prioritising silent performance, the HX1500i offers a clear benefit.

Modular Cabling

Both the Corsair SF850 and HX1500i feature fully modular cabling, allowing users to connect only the cables necessary for their specific builds. This design promotes clean and tidy installations, reducing clutter and improving airflow within the case.

The SF850 utilises Type-5 Micro-Fit PSU connectors, which provide flexible cabling options that are well-suited for compact builds. Meanwhile, the HX1500i’s modular system is designed to accommodate a wider range of components, making it more versatile for various setups. Users seeking ease of installation and cable management will benefit from either option, but the HX1500i's design may cater better to larger systems requiring more power connections.

Software Features

The inclusion of software features can enhance the user experience, especially for those who enjoy customisation. The Corsair HX1500i is equipped with powerful CORSAIR iCUE software, allowing users to create custom fan curves, monitor power settings, and toggle between single to multi-rail overcurrent protection (OCP) on-the-fly. This level of control can be particularly appealing to gamers and enthusiasts who wish to optimise performance dynamically.

In contrast, the SF850 lacks similar software integration, focusing instead on its straightforward, robust performance. Users who prefer a more traditional approach without advanced software might find the SF850 adequate. However, for those who appreciate the ability to fine-tune their system, the HX1500i’s software capabilities offer a distinct advantage.

Reliability and Capacitors

Reliability is a key aspect of any power supply, and both models are designed with high-quality components. The Corsair SF850 includes 105°C rated Japanese capacitors, ensuring stable power delivery and long-lasting performance, particularly in high-temperature environments.

The HX1500i matches this reliability with its own high-quality components, suitable for demanding applications. Both power supplies are built to withstand the rigours of high-performance computing, but the HX1500i’s higher power output may be subjected to more stress under load. Users can expect dependable performance from both models, although the HX1500i may provide an edge in demanding scenarios.

Which should you buy?

Choosing between the Corsair SF850 and the Corsair HX1500i primarily depends on your specific power needs and system requirements. If you are building a compact gaming rig or a mid-range system, the SF850’s 850W output, compact size, and excellent efficiency at £149.99 make it a solid choice. Conversely, if you require a power supply for a high-end setup with multiple GPUs or extensive overclocking, the HX1500i’s 1500W capacity, advanced cooling, and software features at £229.00 justify the higher price.

Ultimately, both power supplies deliver exceptional reliability and performance, but your choice will hinge on the scale of your system and whether you value additional features like software control and enhanced cooling capabilities.