CORSAIR RM850x Fully Modular Low-Noise ATX Power Supply vs CORSAIR RM650e

Price Comparison

The CORSAIR RM850x is priced at £124.40, while the CORSAIR RM650e is significantly cheaper at £71.57. This represents a price difference of £52.83, making the RM650e a more budget-friendly option. For users looking to save on their power supply, the RM650e may present a compelling choice without sacrificing essential features. However, the RM850x justifies its higher price with enhanced specifications and capabilities.

Power Efficiency

Power efficiency is a crucial factor in evaluating power supplies. The RM850x boasts a Cybenetics Gold certification, achieving up to 91% efficiency. In contrast, while the RM650e does not specify a particular efficiency rating, it is Intel ATX 3.1 certified, indicating it can handle transient power excursions effectively. Users aiming to lower their energy consumption and operating costs might find the RM850x more appealing due to its higher efficiency rating.

Modularity

Both the RM850x and RM650e feature fully modular designs, allowing users to connect only the cables necessary for their builds. This not only simplifies cable management but also enhances airflow within the case. However, the RM850x's additional focus on ultra-flexible embossed cables with low-profile combs may offer a slight edge in aesthetics and ease of installation, especially for those who prioritise a clean setup.

Cooling Solutions

Cooling performance varies between the two units. The RM850x is specifically noted for its low-noise operation, which is an essential aspect for users seeking a quiet computing environment. Meanwhile, the RM650e incorporates a 120mm rifle bearing fan designed to minimise noise even under full load. Both power supplies aim to keep temperatures down, but the RM850x’s reputation for enhanced low-noise operation could be crucial for noise-sensitive users.

Compatibility

Compatibility with modern components is vital for any power supply. The RM850x supports the latest PCIe 5.1 standard, thanks to its ATX 3.1 compliance and a native 12V-2x6 connector. This ensures that it can seamlessly connect to the latest graphics cards without requiring adapters. Similarly, the RM650e is also ATX 3.1 certified and supports PCIe 5.1, making both units compatible with cutting-edge hardware. However, the RM850x may provide a slight advantage due to its specific connector design for GPUs.

Capacitor Quality

The quality of capacitors can significantly impact the reliability of a power supply. The RM850x does not specify its capacitor ratings, while the RM650e is equipped with 105°C-rated capacitors. This indicates that the RM650e is designed to handle high temperatures effectively, which can contribute to its overall longevity and performance. Users who prioritise reliability in their components might lean towards the RM650e for this reason.

Noise Levels

Both power supplies are engineered for low noise, but they achieve it through different means. The RM850x is highlighted for its low-noise operation, which appeals to users who value a quiet computing experience. The RM650e, on the other hand, uses a specially calculated fan curve to ensure that the fan noise remains minimal, even under full load. While both power supplies are designed to operate quietly, the RM850x may have a more established reputation in this regard, which could influence purchasing decisions for audiophiles or those in noise-sensitive environments.

Which should you buy?

Choosing between the CORSAIR RM850x and the CORSAIR RM650e ultimately depends on your specific needs and budget. If you require a power supply with higher efficiency, better compatibility with new graphics cards, and a reputation for low noise, the RM850x is worth the extra investment. However, if you are looking for a more affordable option that still delivers solid performance and essential features, the RM650e is a strong contender. Both power supplies cater to different segments of the market, ensuring that users can find a suitable option based on their individual requirements.