CORSAIR CX650 80 PLUS Bronze Non Modular Low-Noise ATX 650 Watt Power Supply - U vs Be Quiet! Pure Power 13M ATX 3.1-850w - 80 Plus Gold
Updated August 2026 — The Be Quiet! Pure Power 13M offers superior efficiency and power output, making it the better choice for high-performance systems, while the CORSAIR CX650 is a budget-friendly option for standard needs.
The Be Quiet! Pure Power 13M offers superior efficiency and power output, making it the better choice for high-performance systems, while the CORSAIR CX650 is a budget-friendly option for standard needs.
Why CORSAIR CX650 80 PLUS Bronze Non Modular Low-Noise ATX 650 Watt Power Supply - U is better
lower price
CORSAIR CX650 costs £44.99
sufficient power
650 watts is adequate for mid-range systems
compact size
125mm length fits in most cases
Why Be Quiet! Pure Power 13M ATX 3.1-850w - 80 Plus Gold is better
higher efficiency
80 Plus Gold certification exceeds 90% efficiency
greater power output
850 watts supports high-performance setups
silent operation
designed for low noise levels
Overall score
Specifications
| Spec | CORSAIR CX650 80 PLUS Bronze Non Modular Low-Noise ATX 650 Watt Power Supply - U | Be Quiet! Pure Power 13M ATX 3.1-850w - 80 Plus Gold |
|---|---|---|
| Certification | 80 PLUS Bronze | 80 Plus Gold |
| Continuous Power | 650W | 850W |
| Cooling Fan | 120mm | 120mm |
| Noise Level | low | very low |
| Price | £44.99 | £108.79 |
Dimension comparison
Overview of the Products
In this comparison, we will look at the CORSAIR CX650 80 PLUS Bronze Non Modular Low-Noise ATX 650 Watt Power Supply and the Be Quiet! Pure Power 13M ATX 3.1-850w - 80 Plus Gold. The CORSAIR power supply is priced at £44.99, while the Be Quiet! model is significantly more expensive at £108.79. This price difference raises important questions about performance, efficiency, and value for money between these two options.
Pricing Comparison
The price of the CORSAIR CX650 is £44.99, making it a budget-friendly option for users looking for a reliable power supply. In contrast, the Be Quiet! Pure Power 13M is priced at £108.79, which is more than double the cost of the CORSAIR unit. This substantial price gap indicates that the Be Quiet! model may offer enhanced features or capabilities that justify its higher price. For users on a tight budget or those who require only moderate power output, the CORSAIR may represent a more economical choice.
Efficiency Ratings
Efficiency is a critical factor when selecting a power supply. The CORSAIR CX650 is 80 PLUS Bronze certified, guaranteeing up to 88% operational efficiency under typical loads. This means it generates less heat and lowers energy costs, which is beneficial for long-term use. On the other hand, the Be Quiet! Pure Power 13M boasts an 80 Plus Gold certification. This certification typically ensures even greater efficiency, particularly at higher loads, potentially exceeding 90% efficiency. Thus, those seeking optimal energy savings and a greener footprint may prefer the Be Quiet! model, especially for high-performance systems.
Power Output
The CORSAIR CX650 offers a continuous power output of 650 watts, which is adequate for many mid-range gaming and workstations. However, the Be Quiet! Pure Power 13M provides a more powerful output of 850 watts. This additional power can accommodate systems with higher demands, such as those with multiple GPUs or extensive peripheral setups. Users planning to build more powerful systems or upgrade their components in the future may find the Be Quiet! model to be a better investment due to its higher wattage capabilities.
Noise Levels
Noise levels can significantly impact the overall user experience, particularly in environments where silence is valued. The CORSAIR CX650 features a 120mm thermally controlled low-noise cooling fan that only ramps up under heavy loads. This means that under normal conditions, the unit operates quietly, making it suitable for quiet builds. The Be Quiet! Pure Power 13M, as its name suggests, is also designed for silent operation, although specific noise levels are not detailed. Given the brand's focus on low-noise performance, it is reasonable to assume that this model will also perform well in this regard, appealing to users who prioritise a silent PC operation.
Build Quality and Design
Build quality can greatly influence both the longevity and reliability of a power supply. The CORSAIR CX650 features black sleeved cables and a black powder-coated casing, allowing it to blend seamlessly into most PC builds. Its compact casing, measuring 125mm in length, ensures compatibility with a wide range of cases. Meanwhile, the Be Quiet! Pure Power 13M is designed with a focus on aesthetics and functional design, although specific details on its build quality are not provided. Users may appreciate the styling of both units, but the lack of detailed information on the Be Quiet! model makes it difficult to compare in this regard.
Target Audience
The target audience for these two power supplies varies significantly. The CORSAIR CX650 is ideal for budget-conscious users or those with standard computing needs who require reliable performance without breaking the bank. Its lower price point and sufficient power output make it a suitable choice for gamers and casual users alike. Conversely, the Be Quiet! Pure Power 13M targets users who demand higher efficiency and power output. It is better suited for high-performance systems or users who prioritise reduced energy costs and silent operation, making it an appealing option for enthusiasts and professionals alike.
Which should you buy?
The choice between the CORSAIR CX650 and the Be Quiet! Pure Power 13M ultimately depends on your specific needs and budget. If you are seeking an affordable, reliable power supply with sufficient output for mid-range systems, the CORSAIR CX650 at £44.99 is a solid option. However, if you require higher wattage, greater efficiency, and silent operation, the Be Quiet! Pure Power 13M is worth its higher price of £108.79. Consider your power requirements, budget, and the importance of efficiency and noise levels to determine which product is the best fit for your setup.
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