CORSAIR RM850e vs CORSAIR CX650 80 PLUS Bronze Non Modular Low-Noise ATX 650 Watt Power Supply - U

Overview of the Power Supplies

When choosing between the CORSAIR RM850e and the CORSAIR CX650, the key difference lies in their power capacities and modular designs. The RM850e offers a higher wattage of 850W, while the CX650 provides 650W, making the former a more suitable option for high-performance systems.

The RM850e is a fully modular power supply, allowing users to connect only the cables they need, which can lead to a neater build and improved airflow. In contrast, the CX650 is a non-modular unit, which might result in excess cabling in your case. This modularity can significantly affect the overall aesthetics and organisation within the PC.

Efficiency and Certification

The efficiency ratings of both power supplies highlight their operational effectiveness. The RM850e is Intel ATX 3.1 certified, supporting the latest power standards and ensuring compatibility with next-gen components. The CX650, on the other hand, is 80 PLUS Bronze certified, which guarantees an efficiency of up to 88%.

This efficiency translates to lower heat generation and reduced energy costs over time. While the RM850e is geared towards high-performance systems requiring significant power draw, the CX650's efficiency makes it an attractive choice for budget-conscious builds or mid-range systems.

Noise Levels

Noise levels are a crucial consideration for many users, and both power supplies have features designed to minimise sound. The RM850e boasts a 120mm rifle bearing fan that maintains low noise levels, even under full load, due to its specially calculated fan curve.

In comparison, the CX650 features a thermally controlled fan that only ramps up during heavy use, allowing for quieter operation at lower loads. This design makes the CX650 appealing to users who prioritise a silent computing experience. Ultimately, both power supplies are designed to operate quietly, but the RM850e may have an edge under high-demand scenarios.

Build Quality and Components

The build quality of a power supply can greatly influence its longevity and performance. The RM850e is equipped with 105°C-rated capacitors, which are designed to provide steady and reliable power. This quality can lead to enhanced performance and durability, especially under strenuous conditions.

Conversely, the CX650 does not specify the temperature rating of its capacitors, but it does guarantee full continuous power delivery at its rated wattage. While both power supplies are manufactured by Corsair, the RM850e's higher quality components suggest it may be more resilient and reliable over time, particularly for more demanding systems.

Size and Compatibility

Size is another important factor to consider, especially when it comes to fitting power supplies into modern PC cases. The RM850e has not specified its dimensions, but being a high-capacity unit, it is likely to be slightly larger. The CX650, however, is compact at 125mm in length, making it easier to fit into tighter spaces.

This compact design of the CX650 allows for greater compatibility with a wider range of cases, which is beneficial for users with limited space. If size and compatibility are significant concerns for your build, the CX650 could be the more practical option.

Pricing and Value for Money

Price is often a deciding factor when choosing between two products. The RM850e is priced at £85.99, reflecting its higher capacity and advanced features. In contrast, the CX650 is considerably cheaper at £44.99, making it an attractive option for users on a budget or those who do not require high wattage.

While the RM850e provides more power and modularity, the CX650 offers excellent value for its price, especially for standard gaming or office builds. Users must weigh the cost against their specific power needs and whether the additional features of the RM850e justify the higher price.

Which should you buy?

Choosing between the CORSAIR RM850e and the CORSAIR CX650 ultimately boils down to your specific requirements and budget. If you are building a high-performance gaming rig or a workstation that demands significant power, the RM850e, with its 850W capacity and fully modular design, is likely the better choice.

However, if you're looking for a cost-effective solution for a mid-range build or a quieter operation, the CX650 offers solid performance at a more accessible price point. Considering the RM850e's superior efficiency and build quality, it may be worth the investment for serious users, while the CX650 remains an excellent option for those prioritising value and simplicity.