CORSAIR CX650 80 PLUS Bronze Non Modular Low-Noise ATX 650 Watt Power Supply - U vs CORSAIR RM1000x SHIFT

Overview of the Power Supplies

When comparing the CORSAIR CX650 and the CORSAIR RM1000x SHIFT, it is evident that they cater to different needs and budgets. The CX650 is a budget-friendly option priced at £44.99, while the RM1000x SHIFT is a premium power supply retailing for £164.99. This significant price difference indicates varying features and capabilities, making it essential to consider what you need from a power supply.

Efficiency and Performance

The CORSAIR CX650 boasts an 80 PLUS Bronze certification, delivering up to 88% operational efficiency. This efficiency means it generates less heat and reduces energy costs, making it a suitable choice for users looking to save on electricity bills. In contrast, while the RM1000x SHIFT does not specify an efficiency rating, its advanced features suggest it is designed for high-performance systems, likely prioritising reliability and power delivery over basic efficiency metrics.

Cooling Solutions

Cooling is a vital aspect of any power supply, and both models address this differently. The CX650 features a 120mm thermally controlled low-noise cooling fan that adjusts its speed based on load, ensuring quieter operation during light usage. On the other hand, the RM1000x SHIFT uses a 140mm fluid dynamic bearing fan, which is engineered for high performance and low noise, potentially offering superior cooling under heavy loads. This could be a decisive factor for users who place high demands on their systems.

Compatibility and Size

In terms of compatibility, the CORSAIR CX650 is designed to fit into almost all modern PC cases thanks to its compact 125mm length. This makes it an excellent choice for users with limited space. The RM1000x SHIFT, being a fully modular power supply, offers innovative side connections that facilitate easier access for cable management. This design not only enhances compatibility with various builds but also promotes a cleaner and more organised internal layout, appealing to users focused on aesthetics and ease of installation.

Cable Management

When it comes to cable management, the RM1000x SHIFT excels with its innovative features. It includes fully modular connectors and a debossed PVC cable kit, which are designed to provide flexibility and a neater overall look. The inclusion of low-profile combs enhances this effect, simplifying the routing of cables. Conversely, the CX650, while it has black sleeving and casing that fits nicely with most PC aesthetics, does not offer the same level of modularity or advanced cable management features, which may be a drawback for users seeking a streamlined build.

Power Delivery

Power delivery is another area where these two power supplies differ significantly. The CX650 guarantees its full rated wattage of continuous power, making it reliable for systems that do not exceed its capacity. In comparison, the RM1000x SHIFT is designed with a native 12V-2x6 GPU cable, optimised for powering modern graphics cards, such as the NVIDIA GeForce RTX 50 Series. This capability makes the RM1000x SHIFT more suitable for high-end gaming and demanding applications, appealing to enthusiasts and professionals.

Noise Levels

Noise levels can significantly affect user experience, especially in quiet environments. The CX650 aims for low noise through its thermally controlled fan, which only ramps up under heavy load. This feature is advantageous for users who operate their systems for long periods without high demand. The RM1000x SHIFT, with its fluid dynamic bearing fan, also prioritises low noise. However, it is explicitly engineered for high performance, suggesting that while it remains quiet, it may handle noise differently under various operational conditions.

Which should you buy?

Choosing between the CORSAIR CX650 and the CORSAIR RM1000x SHIFT comes down to your specific needs and budget. If you're looking for a cost-effective power supply that offers good efficiency and reliable performance for everyday systems, the CX650 at £44.99 is a solid choice. However, if you need a high-performance power supply that excels in cable management, cooling, and is capable of powering high-end components, the RM1000x SHIFT at £164.99 is undoubtedly the better option. Ultimately, your decision should be based on the power demands of your system and your budgetary constraints.