CORSAIR CX650 80 PLUS Bronze Non Modular Low-Noise ATX 650 Watt Power Supply - U vs NZXT C850 SFX Gold - 850W SFX ATX 3.1 Power Supply - 80 Plus Gold - Cybenetics P

Price Comparison

The CORSAIR CX650 is significantly more affordable than the NZXT C850, priced at £44.99 compared to £129.98. This substantial difference of £85 reflects the varying capabilities and features of these power supplies. While the CORSAIR model is an excellent budget-friendly option for users needing reliable performance, the NZXT power supply offers advanced features that cater to high-demand systems, justifying its higher price point. For those on a budget or with mid-range systems, the CORSAIR CX650 presents a compelling choice without sacrificing quality.

Efficiency Ratings

The efficiency ratings of these power supplies highlight their operational effectiveness. The CORSAIR CX650 is 80 PLUS Bronze certified, which indicates it operates with up to 88% efficiency. In contrast, the NZXT C850 boasts an 80 PLUS Gold rating, demonstrating superior efficiency with potentially lower heat output and energy costs. The Gold certification means that the NZXT C850 can achieve efficiencies above 90%, making it a more energy-efficient option for high-performance builds. This difference in efficiency can translate into long-term savings on energy bills, making the NZXT more appealing for power users.

Power Output

When it comes to power output, the NZXT C850 significantly outshines the CORSAIR CX650, offering 850 watts compared to the latter's 650 watts. This 200-watt difference provides users with more headroom for high-performance components, particularly powerful graphics cards. For gamers or professionals using demanding applications, the increased wattage of the NZXT ensures a stable power supply even under heavy loads, which is crucial for maintaining system stability and performance. Conversely, the CORSAIR’s 650 watts is suitable for less demanding setups, making it adequate for casual users or those with mid-range hardware.

Form Factor

The form factor of these power supplies affects their compatibility with various PC builds. The CORSAIR CX650 is designed in a standard ATX format, which fits well in most PC cases. On the other hand, the NZXT C850 utilises the SFX form factor, allowing it to maximise space efficiency, particularly in compact builds. This makes the NZXT a better choice for users looking to create small form factor (SFF) PCs without compromising on power delivery. The choice of form factor is crucial for system builders, as it influences both aesthetics and practicality in assembling a PC.

Cooling Solutions

In terms of cooling, both power supplies feature effective systems to manage heat, but they approach it differently. The CORSAIR CX650 includes a 120mm thermally controlled fan that operates quietly at lower loads, only ramping up under heavy stress. This ensures a low-noise operation, making it suitable for quieter environments. In contrast, the NZXT C850 utilises a 92mm fluid dynamic bearing (FDB) fan that also includes a Zero RPM mode for silent operation. While both fans are designed to enhance performance without excessive noise, the NZXT's advanced cooling technology may provide a slight edge in terms of durability and efficiency, particularly in high-performance settings.

Connectivity Options

Connectivity options are essential for ensuring compatibility with various components. The CORSAIR CX650 offers reliable connectivity with standard cables and connectors suitable for most builds. However, the NZXT C850 includes an ATX 3.1 certification and a 600W 12V-2x6 connector, specifically designed to support modern graphics cards safely and efficiently. This feature ensures that users can leverage the full capabilities of cutting-edge hardware without worrying about power delivery issues. The enhanced connectivity of the NZXT makes it particularly appealing for gamers or content creators using high-end graphics cards.

Noise Levels

Noise levels are a critical consideration for many PC builders. The CORSAIR CX650 is designed for low-noise operation, with its fan spinning at higher speeds only when necessary, which is ideal for users who prefer a quieter PC. The NZXT C850, with its Cybenetics A- noise rating, also prioritises quiet performance while maintaining premium efficiency. Both power supplies are engineered for low noise, but the NZXT's additional features may provide an even quieter environment, especially under load. For users sensitive to noise or those setting up a home office, both options offer commendable solutions, but the NZXT could be the better choice for extreme silence.

Which should you buy?

Choosing between the CORSAIR CX650 and the NZXT C850 ultimately depends on your specific needs and budget. If you're looking for an affordable, reliable power supply for a standard build, the CORSAIR CX650 at £44.99 is an excellent option, providing good efficiency and low noise levels for everyday use. However, for those requiring higher wattage, advanced features, and superior efficiency, the NZXT C850, priced at £129.98, is worth the investment. Its SFX form factor and enhanced connectivity make it ideal for modern, high-performance systems. Consider your current and future needs carefully to make the best choice for your build.