CORSAIR RM850x Fully Modular Low-Noise ATX Power Supply vs CORSAIR RM750e

Overview of the Corsair RM850x and RM750e

The CORSAIR RM850x is priced at £124.40, while the CORSAIR RM750e is more budget-friendly at £81.99. This price difference of £42.41 highlights the varying features each power supply offers for different user needs. The RM850x is designed for high performance and efficiency, whereas the RM750e balances affordability with reliable power delivery.

Power Output and Efficiency

The RM850x boasts an exceptional efficiency rating of up to 91%, as evidenced by its Cybenetics Gold certification. This means it consumes less power, leading to lower electricity bills and reduced heat generation during operation. In contrast, the RM750e does not specify its efficiency rating but is Intel ATX 3.1 certified, ensuring it meets the necessary standards for modern builds. The RM850x's higher efficiency is a significant advantage for users prioritising power savings and thermal performance.

Modular Cabling

Both the RM850x and RM750e feature fully modular cabling systems, allowing users to connect only the cables necessary for their builds. This design enhances cable management and airflow within the PC case. However, the RM850x includes embossed cables with low-profile combs, which not only look sleek but also improve flexibility during installation. While the RM750e offers reliable modularity, the added aesthetic and practical benefits of the RM850x’s cables may appeal more to builders aiming for a tidy setup.

Compliance with Standards

The RM850x meets the latest ATX 3.1 power standard, supporting PCIe 5.1 and providing robust protection against transient power spikes. This compliance ensures that it can handle the demands of the latest graphics cards without issue. The RM750e also adheres to the ATX 3.1 standard and can withstand 2x transient power excursions from the GPU. While both power supplies are compliant, the RM850x's additional features may provide extra peace of mind for users with high-end components.

Cooling and Noise Levels

The RM850x incorporates advanced cooling solutions, including a low-noise design that enhances its performance. The product's emphasis on low noise is further supported by its efficiency rating, which reduces heat and the need for aggressive cooling. On the other hand, the RM750e utilises a 120mm rifle bearing fan that is designed to minimise noise, even under full load. While both units focus on quiet operation, the RM850x’s design may be slightly more effective due to its higher efficiency.

Component Quality

One of the standout features of the RM750e is its 105°C-rated capacitors, which ensure reliable power delivery and consistent electrical performance. This specification indicates a robust design that can handle high temperatures without compromising stability. The RM850x does not specify its capacitor rating, which makes the RM750e a potentially more reliable option for users concerned about long-term performance under load.

User Experience and Installation

Both power supplies are designed for ease of installation, thanks to their fully modular designs. However, the RM850x’s embossed cables provide additional benefits in terms of aesthetics and flexibility, making the installation process not just functional but visually appealing. Users who value a clean build will likely appreciate the RM850x more. Conversely, the RM750e, while efficient and reliable, may not offer the same level of visual enhancement during installation.

Which should you buy?

Choosing between the CORSAIR RM850x and the RM750e ultimately depends on your specific needs and budget. The RM850x, priced at £124.40, is ideal for users looking for high efficiency, advanced features, and superior build quality. Its higher power output and efficiency ratings make it suitable for high-end builds. Conversely, the RM750e offers solid performance at a lower price point of £81.99, making it an excellent choice for budget-conscious users who still require reliable power delivery. If you prioritise performance and are willing to invest more, the RM850x is the better option; however, the RM750e is a commendable choice for those seeking value without sacrificing quality.