CORSAIR SF850 vs CORSAIR RM1000x SHIFT

Price Comparison

The CORSAIR SF850 is priced at £149.99, while the CORSAIR RM1000x SHIFT is slightly more expensive at £164.99. This £15 difference positions the SF850 as a more budget-friendly option for those seeking high-quality power supplies. While both models cater to users who demand reliable performance, the price differential may influence purchasing decisions, especially for gamers and professionals on a budget. Despite the RM1000x SHIFT's higher cost, it offers additional features that may justify the investment for some users.

Power Efficiency

Both the CORSAIR SF850 and RM1000x SHIFT are designed with efficiency in mind, boasting 80 PLUS Platinum ratings. This means they both deliver over 90% efficiency at typical loads, which is crucial for reducing electricity costs and ensuring optimal performance. The SF850’s compact SFX form factor is particularly advantageous for small-form-factor PCs, allowing users to maximise power efficiency without sacrificing space. Meanwhile, the RM1000x SHIFT's innovative design contributes to its overall high efficiency, making both power supplies excellent choices for energy-conscious users.

Form Factor

The CORSAIR SF850 features a compact SFX form factor, ideal for building powerful systems in tight spaces. This design is especially beneficial for small-form-factor PC builders who want to maximise both power and space. On the other hand, the RM1000x SHIFT adopts a standard ATX form factor, which may appeal to users with larger cases who require more room for additional components. While both power supplies are fully modular, the SF850's smaller dimensions allow for a more versatile fit in diverse setups, making it preferable for compact builds.

Modular Design

Modularity is a key design feature in both the CORSAIR SF850 and RM1000x SHIFT. The SF850 employs fully modular, Type-5 Micro-Fit PSU connectors, promoting tidy cable management and compatibility in smaller cases. This feature is particularly helpful for users who value a clean aesthetic and efficient airflow. Conversely, the RM1000x SHIFT also boasts fully modular connectors, but its innovative side-access connection position allows for easier cable management and access. This convenience can significantly simplify the building process, making the RM1000x SHIFT a strong contender for users prioritising ease of installation.

Cooling Solutions

Cooling is essential for maintaining performance and reliability in power supplies. The CORSAIR SF850 utilises a 92mm PWM cooling fan that is designed for low-noise operation, ensuring that it remains quiet even under load. In contrast, the RM1000x SHIFT features a larger 140mm fluid dynamic bearing fan, which is engineered to deliver high performance while maintaining low noise levels. The increased size of the fan in the RM1000x SHIFT can provide improved airflow and cooling efficiency, making it more suitable for high-performance systems that generate significant heat.

Compatibility with Modern Components

The CORSAIR SF850 is ATX 3.1 compliant and PCIe 5.1 ready, making it an excellent choice for users looking to support the latest hardware advancements, including next-generation graphics cards. This forward compatibility ensures that the SF850 will continue to provide reliable power for evolving systems. The RM1000x SHIFT also offers a native 12V-2x6 GPU cable, which simplifies powering modern graphics cards such as the NVIDIA GeForce RTX 50 Series. This feature makes it particularly appealing for gamers and content creators who demand high performance from their rigs.

Build Quality and Reliability

Both the CORSAIR SF850 and RM1000x SHIFT are built with high-quality components, including 105°C rated Japanese capacitors, ensuring reliability and longevity in demanding situations. The use of quality materials enhances the overall durability of both power supplies, reducing the risk of failure. Corsair's reputation for crafting reliable power supplies further solidifies the trustworthiness of both models, making either choice a sound investment for users who require consistent performance over time.

Which should you buy?

Choosing between the CORSAIR SF850 and the RM1000x SHIFT ultimately depends on your specific needs and budget. If you are looking for a more compact option that offers excellent efficiency at a lower price point of £149.99, the SF850 is a fantastic choice. However, if you value innovative design features, such as the easy-access connection position and a larger cooling fan, and are willing to invest an additional £15, the RM1000x SHIFT at £164.99 may be the better option for your build. Both power supplies provide excellent performance, but your choice will hinge on whether you prioritise size, price, or advanced features.