CORSAIR CX650 80 PLUS Bronze Non Modular Low-Noise ATX 650 Watt Power Supply - U vs CORSAIR RM1200x SHIFT Fully Modular ATX Power Supply - 80 PLUS Gold - ATX 3.1 -

Introduction

When choosing a power supply for your PC, the options available can be overwhelming. In this comparison, we will look at two Corsair power supplies: the CORSAIR CX650 80 PLUS Bronze Non Modular Low-Noise ATX 650 Watt Power Supply and the CORSAIR RM1200x SHIFT Fully Modular ATX Power Supply. Priced at £44.99 and £174.98, respectively, these units cater to different needs and budgets.

Power Efficiency

The CORSAIR CX650 boasts an 80 PLUS Bronze certification, ensuring up to 88% operational efficiency. This level of efficiency means that less heat is generated, ultimately lowering energy costs. In contrast, the CORSAIR RM1200x SHIFT takes it a step further with an 80 PLUS Gold rating, indicating even higher efficiency at a minimum of 90%. This significant difference can lead to noticeable savings on electricity bills over time, particularly for high-performance systems that demand more power.

Modular Design

One key distinction is the modularity of these power supplies. The CORSAIR CX650 is a non-modular unit, which means all cables are fixed and cannot be removed. This can lead to a messier build and potentially obstruct airflow inside the case. On the other hand, the CORSAIR RM1200x SHIFT is fully modular, allowing users to connect only the cables they need. This design not only simplifies cable management but also enhances airflow within the PC, making it a more attractive option for those who prioritise aesthetics and organisation.

Cooling Performance

Cooling is a crucial factor when it comes to power supplies, especially under load. The CORSAIR CX650 features a thermally controlled 120mm fan that operates quietly, spinning faster only when the unit is under heavy stress. This design helps maintain a quieter environment during normal operation. Meanwhile, the CORSAIR RM1200x SHIFT utilises a 140mm fluid dynamic bearing fan, known for its durability and efficiency. This fan is designed with a specially calculated curve for optimal performance, resulting in lower noise levels and improved reliability over time.

Size and Compatibility

When considering the physical dimensions of these power supplies, the CORSAIR CX650 is compact at 125mm in length, ensuring it fits easily into most modern PC cases. This can be a crucial factor for builders with limited space. The CORSAIR RM1200x SHIFT, while not explicitly stated in the provided data, typically adheres to standard ATX dimensions, which means it should also fit comfortably in most cases. However, the emphasis on modularity in the RM1200x SHIFT allows for more flexible installation, as users can manage cable connections more efficiently.

Component Quality

The quality of internal components can significantly affect the longevity and performance of a power supply. The CORSAIR CX650 is designed to deliver its full rated wattage continuously, which is a reliable feature for consistent power delivery. In contrast, the CORSAIR RM1200x SHIFT is equipped with 100% 105°C-rated Japanese electrolytic capacitors, which are known for their high performance and long-term reliability. This premium construction contributes to the RM1200x SHIFT's ability to resist transient power spikes and maintain stable power delivery under demanding conditions.

Target Use Cases

The CORSAIR CX650 is an excellent choice for budget-conscious users building a standard gaming or office PC. Its low price point of £44.99 makes it an attractive option for those who do not require excessive power or advanced features. Conversely, the CORSAIR RM1200x SHIFT, priced at £174.98, is aimed at high-end users, particularly gamers and professionals who need superior power management and efficiency for demanding setups. Its advanced features cater to those who plan on utilising high-performance components, including the latest GPUs that require robust power delivery.

Which should you buy?

Choosing between the CORSAIR CX650 and the CORSAIR RM1200x SHIFT ultimately depends on your specific needs and budget. If you are looking for an affordable, reliable power supply for a standard build, the CX650 offers excellent efficiency and performance at a competitive price. However, if you are investing in a high-performance system and prioritise modularity, advanced cooling, and superior component quality, the RM1200x SHIFT is worth the investment. The decision comes down to whether you value cost-effectiveness or cutting-edge technology and performance in your power supply choice.