CORSAIR CX650 80 PLUS Bronze Non Modular Low-Noise ATX 650 Watt Power Supply - U vs MONTECH Century II - 850W High-End ATX Gaming Power Supply - 80 Plus Gold & Cybe
Updated August 2026 — The MONTECH Century II outperforms the CORSAIR CX650 in efficiency, power output, and modular design, making it the better choice for high-performance needs.
The MONTECH Century II outperforms the CORSAIR CX650 in efficiency, power output, and modular design, making it the better choice for high-performance needs.
Why CORSAIR CX650 80 PLUS Bronze Non Modular Low-Noise ATX 650 Watt Power Supply - U is better
lower price
CORSAIR CX650 is £44.99 compared to MONTECH's £80.04
compact size
CORSAIR CX650 has a length of 125mm for easier fitting
low noise
CORSAIR CX650 features a low-noise cooling fan
Why MONTECH Century II - 850W High-End ATX Gaming Power Supply - 80 Plus Gold & Cybe is better
higher efficiency
MONTECH Century II has 80 PLUS Gold certification
greater power
MONTECH Century II offers 850 watts compared to 650 watts
modular design
MONTECH Century II allows for better cable management
Overall score
Specifications
| Spec | CORSAIR CX650 80 PLUS Bronze Non Modular Low-Noise ATX 650 Watt Power Supply - U | MONTECH Century II - 850W High-End ATX Gaming Power Supply - 80 Plus Gold & Cybe |
|---|---|---|
| Brand | Corsair | Montech |
| Certification | 80 PLUS Bronze | 80 PLUS Gold |
| Modular | Non-Modular | Fully Modular |
| Cooling Type | Low-Noise Fan | Advanced Cooling |
| Price | £44.99 | £80.04 |
Dimension comparison
Overview of the Power Supplies
In this comparison, we examine two power supplies: the CORSAIR CX650 80 PLUS Bronze Non Modular Low-Noise ATX 650 Watt Power Supply and the MONTECH Century II - 850W High-End ATX Gaming Power Supply. The CORSAIR model is priced at £44.99, while the MONTECH model is more premium at £80.04. Both offer distinct features catering to different user needs.
The CORSAIR CX650 is designed for efficient performance with an 80 PLUS Bronze certification, ensuring up to 88% operational efficiency. This efficiency translates to lower energy costs, which can be appealing for users looking to reduce their bills. On the other hand, the MONTECH Century II boasts an 80 PLUS Gold certification, indicating even higher efficiency levels, which can be crucial for high-performance gaming rigs.
Efficiency and Certification
When it comes to energy efficiency, the MONTECH Century II takes a clear lead with its 80 PLUS Gold certification, compared to the CORSAIR CX650's 80 PLUS Bronze. The difference in certification indicates that the MONTECH delivers superior efficiency, potentially reaching up to 90% efficiency under optimal conditions, significantly reducing energy waste.
The CORSAIR CX650, while still commendable with its 88% efficiency, may not provide the same level of savings on energy bills over time. For users who prioritise long-term efficiency and energy savings, the MONTECH's higher rating makes it the better choice.
Power Output and Performance
The power output is another critical factor in this comparison. The CORSAIR CX650 offers a solid 650 watts, which is adequate for most standard builds, especially for general use and light gaming. However, the MONTECH Century II provides a robust 850 watts, catering to high-end gaming setups that require more power to support multiple components, including high-performance GPUs.
For users who plan on building a powerful gaming rig or wish to future-proof their setup, the additional 200 watts from the MONTECH can make a significant difference in performance and stability under heavy loads.
Design and Modularity
In terms of design, the CORSAIR CX650 offers a compact casing of 125mm in length, making it easier to fit in various PC cases. Its non-modular design means that all cables are permanently attached, which can lead to a more cluttered interior if not managed properly.
Conversely, the MONTECH Century II is a fully modular power supply, allowing users to connect only the cables they need. This feature not only simplifies cable management but also enhances airflow within the case, potentially improving overall cooling and system performance. For those who value aesthetics and organisation in their builds, the modular design of the MONTECH could be a significant advantage.
Cooling Solutions
Cooling is an essential aspect of any power supply, and both models have unique approaches. The CORSAIR CX650 features a 120mm thermally controlled low-noise cooling fan that operates quietly under low loads, spinning up only during periods of heavy use. This results in a quieter computing environment, which can be especially beneficial for office or home setups.
In contrast, while the MONTECH Century II's cooling specifications are not detailed, it is designed as a high-end gaming power supply. Typically, such models incorporate advanced cooling solutions to handle the increased demands of gaming hardware. For gamers who prioritise performance and cooling efficiency during intensive gaming sessions, the MONTECH may provide a more robust cooling solution, although specifics are not provided in the data.
Warranty and Longevity
Warranty is an important consideration when choosing a power supply, and the MONTECH Century II offers a notable 10-year warranty. This extended coverage reflects the manufacturer’s confidence in the product's durability and reliability, making it a safer investment for users who intend to keep their hardware for a long time.
On the other hand, the warranty details for the CORSAIR CX650 are not mentioned, which could suggest a shorter coverage period. For users who value peace of mind and long-term reliability, the MONTECH’s extensive warranty is a compelling feature that adds to its overall value.
Target Audience
The target audience for each power supply varies significantly due to their differing specifications and features. The CORSAIR CX650 is ideally suited for casual users and those with moderate computing needs. It is a solid choice for budget-conscious consumers who want reliable power without the need for premium features.
In contrast, the MONTECH Century II is clearly aimed at gamers and enthusiasts who demand high performance and efficiency. Its higher wattage, modular design, and premium certification make it an excellent choice for those looking to build high-end systems that can handle demanding applications and gaming scenarios.
Which should you buy?
Ultimately, the decision between the CORSAIR CX650 and the MONTECH Century II hinges on your specific needs and budget. If you are a casual user looking for an affordable, efficient power supply that is easy to install, the CORSAIR CX650 at £44.99 is a solid option. However, if you are a gaming enthusiast or plan to build a high-performance PC, the MONTECH Century II at £80.04 offers superior efficiency, higher power output, and a modular design that enhances both performance and aesthetics. Consider your future needs and choose accordingly.
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