CORSAIR SF850 vs CORSAIR RM1200x SHIFT Fully Modular ATX Power Supply - 80 PLUS Gold - ATX 3.1 -

Overview of the Products

When comparing the CORSAIR SF850 and the CORSAIR RM1200x SHIFT, both are high-quality power supplies but cater to different needs. The SF850 is priced at £149.99, while the RM1200x SHIFT is slightly more expensive at £174.98. The choice between these models primarily revolves around form factor, modularity, and cooling capabilities.

The CORSAIR SF850 is designed for compact spaces, making it ideal for small-form-factor PCs. In contrast, the RM1200x SHIFT, being an ATX power supply, suits larger builds that require higher wattage and more extensive cable management options. Understanding these distinctions is crucial for users when deciding which power supply best fits their system.

Power Rating and Efficiency

The CORSAIR SF850 boasts an 80 PLUS Platinum rating, which guarantees over 90% efficiency during typical loads. This means users can expect significant energy savings and reduced heat output, which is essential for maintaining system longevity.

On the other hand, the RM1200x SHIFT carries an 80 PLUS Gold rating. While still efficient, it does not quite match the Platinum rating of the SF850. This difference may result in slightly higher power bills for users of the RM1200x SHIFT, particularly in high-demand scenarios. Hence, for users prioritising energy efficiency and lower operational costs, the SF850 holds a distinct advantage.

Form Factor and Compatibility

The CORSAIR SF850 is an SFX power supply, optimised for compact builds. This smaller form factor is particularly beneficial for users with limited space within their cases, allowing for better airflow and more efficient use of internal components. Its design is perfect for power-dense setups, which are common in gaming and workstation PCs.

In contrast, the CORSAIR RM1200x SHIFT is an ATX power supply, meaning it will require a larger case for installation. This model is more suited for users who need higher wattage for multiple graphics cards or other demanding components. Therefore, if space is a constraint, the SF850 is the better option, while the RM1200x SHIFT excels in larger, more powerful configurations.

Modular Design

Both the CORSAIR SF850 and the RM1200x SHIFT feature fully modular designs, allowing users to connect only the cables they need. This design philosophy leads to cleaner builds and improved airflow, as unnecessary cables do not clutter the case.

However, the RM1200x SHIFT introduces a unique side connection position, which simplifies access to cables and enhances cable management. This innovation can significantly ease the installation process and subsequent modifications. While both models offer excellent modularity, the RM1200x SHIFT provides a more user-friendly experience, particularly for those who frequently adjust their builds.

Cooling Mechanisms

Cooling is critical for power supply performance and longevity, and both the CORSAIR SF850 and the RM1200x SHIFT have effective cooling systems. The SF850 is equipped with a 92mm PWM cooling fan, designed for low-noise operations while still delivering efficient cooling.

Conversely, the RM1200x SHIFT features a larger 140mm fluid dynamic bearing fan, which utilises a specially calculated fan curve to balance performance and noise. The increased size of the fan allows for better airflow, potentially leading to quieter operation under load. Users prioritising quieter systems may lean towards the RM1200x SHIFT for this reason.

Build Quality and Components

Both power supplies are built with high-quality components, ensuring reliability and performance. The CORSAIR SF850 uses 105°C rated Japanese capacitors, which are known for their durability and consistency. This feature plays a crucial role in delivering stable power under various conditions, a necessity for high-performance systems.

Similarly, the RM1200x SHIFT also utilises 100% 105°C-rated Japanese electrolytic capacitors, promising unwavering power delivery and long-term reliability. While both models offer excellent build quality, users may find peace of mind in knowing that both are constructed with premium components, ensuring longevity in their respective applications.

Price Comparison

The CORSAIR SF850 is priced at £149.99, making it the more budget-friendly option of the two. For users building a compact system who still want high efficiency and quality, the SF850 presents a valuable proposition.

The CORSAIR RM1200x SHIFT, at £174.98, comes with a higher price tag, reflecting its additional features and capabilities, such as the side connection design and enhanced cooling via a larger fan. While the RM1200x SHIFT may be more expensive, it offers features that can justify the cost for users who need higher wattage and better cable management. Therefore, the price difference is significant and should factor into the purchasing decision.

Which should you buy?

In conclusion, the decision between the CORSAIR SF850 and the CORSAIR RM1200x SHIFT should be based on individual needs and system requirements. If you are assembling a small-form-factor PC that prioritises energy efficiency and space, the SF850 is the clear choice, offering Platinum-rated efficiency at a lower price.

However, if your build demands higher wattage, superior cooling, and innovative cable management, the RM1200x SHIFT is worth the investment, despite its higher cost. Ultimately, both power supplies are excellent choices from Corsair, each tailored to specific user needs and preferences.