CORSAIR CX650 80 PLUS Bronze Non Modular Low-Noise ATX 650 Watt Power Supply - U vs CORSAIR RM650e

Overview of Power Supplies

The CORSAIR CX650 and the CORSAIR RM650e are both reputable power supplies from Corsair, but they cater to different user needs and preferences. The CX650 is priced at £44.99, while the RM650e is more premium, retailing at £71.57. Both models come from the trusted Corsair brand, known for its reliability in PC components, but they offer distinct features that make them suitable for different types of builds.

Efficiency Ratings

Efficiency is a crucial factor when selecting a power supply, and the CORSAIR CX650 boasts an 80 PLUS Bronze certification, which ensures up to 88% operational efficiency. This rating helps reduce energy costs and heat generation. On the other hand, the CORSAIR RM650e does not explicitly state its efficiency certification but is compliant with the ATX 3.1 power standard, which suggests a high level of efficiency suitable for modern systems. Users looking for energy savings may find the CX650's certification more appealing, while the RM650e's compliance with newer standards may provide an edge in future-proofing.

Cooling Solutions

Cooling capabilities significantly influence the performance and longevity of power supplies. The CORSAIR CX650 features a 120mm thermally controlled low-noise cooling fan that adjusts its speed according to the load, ensuring quieter operation during light use. In contrast, the CORSAIR RM650e also employs a 120mm fan, but it utilises a rifle bearing design with a specially calculated fan curve, keeping noise levels down even under full load. For users concerned about noise, the RM650e may offer a more refined cooling solution, particularly in demanding scenarios.

Modularity

The level of modularity in a power supply affects both ease of installation and cable management. The CORSAIR CX650 is a non-modular unit, meaning all cables are fixed, which may lead to clutter in cases. Conversely, the CORSAIR RM650e is fully modular, allowing users to connect only the cables necessary for their build. This feature can greatly simplify cable management, particularly in cases with limited space. For those prioritising a clean build and easier installation, the RM650e stands out significantly.

Component Quality

Component quality plays a vital role in the reliability and performance of power supplies. The CORSAIR CX650 is equipped with standard components, ensuring it delivers its rated wattage of 650 watts continuously. Meanwhile, the RM650e features 105°C-rated capacitors, which are designed to provide steady and reliable power, as well as dependable electrical performance. This higher quality of components in the RM650e may result in better durability and efficiency over time, making it a more robust choice for high-performance builds.

Compatibility

Compatibility with modern hardware is essential for any power supply. The CORSAIR CX650 is suitable for most builds, given its full continuous power delivery and compact casing that fits in various PC cases. However, the RM650e takes compatibility a step further with its Intel ATX 3.1 certification, which supports PCIe 5.1 platforms and can endure 2x transient power excursions from the GPU. This makes the RM650e particularly well-suited for high-end gaming or workstation setups that require a more powerful and flexible power solution.

Noise Levels

Noise levels during operation can be a significant factor for users who prefer a quieter environment. The CORSAIR CX650’s cooling fan is designed to operate at lower speeds during lighter loads, providing a quieter experience overall. However, the RM650e’s fan design specifically aims to keep noise levels minimal, even under full load. This focus on quiet operation makes the RM650e an attractive option for users who want a silent PC experience, particularly in gaming or media production environments.

Which should you buy?

Choosing between the CORSAIR CX650 and the CORSAIR RM650e ultimately depends on your specific needs and budget. If you are looking for an affordable power supply with solid efficiency and decent cooling, the CX650 at £44.99 is a great choice. However, if you require a fully modular power supply with superior components, modern compatibility, and a focus on quiet operation, the RM650e priced at £71.57 is worth the investment. For users with high-performance systems or those seeking longevity and reliability in their builds, the RM650e stands out as the preferable option.