NZXT C850 Gold ATX 3.1 - Fully Modular Low-Noise PC Gaming Power Supply - 850 Wa vs NZXT C850 SFX Gold - 850W SFX ATX 3.1 Power Supply - 80 Plus Gold - Cybenetics P

Price Comparison

The NZXT C850 Gold ATX 3.1 is priced at £84.90, while the NZXT C850 SFX Gold costs significantly more at £129.98. This £45.08 difference in price may influence your decision, particularly if budget constraints are a consideration. The C850 Gold offers an attractive price point for those seeking a high-performance power supply without breaking the bank, whereas the C850 SFX Gold justifies its higher price with features tailored for compact builds.

Form Factor

The form factor of a power supply is crucial for compatibility with your PC case. The NZXT C850 Gold is designed in the standard ATX form factor, making it suitable for a wide range of cases. In contrast, the NZXT C850 SFX Gold features a smaller SFX form factor, optimised for compact builds and small form factor cases. This space-saving design enables the C850 SFX Gold to fit into tighter spaces while still delivering full power capabilities, appealing to users looking to maximise space efficiency.

Efficiency Ratings

Efficiency ratings are essential for power supply performance and energy consumption. The NZXT C850 Gold is compliant with the ATX 3.1 standard and boasts a high-quality construction with premium Japanese capacitors. However, the C850 SFX Gold takes efficiency a step further with its 80 PLUS Gold rating and Cybenetics Platinum certification. This higher efficiency not only reduces heat output but also contributes to overall system performance, making the SFX model a more appealing choice for those prioritising efficiency.

Cooling Solutions

Cooling solutions in power supplies can directly affect system noise and longevity. The NZXT C850 Gold incorporates a 135mm fluid dynamic bearing fan that operates silently under 50% load, ensuring a quiet gaming experience. On the other hand, the C850 SFX Gold is equipped with a 92 mm fluid dynamic bearing fan that includes a Zero RPM mode for silent operation. Although both units aim for quiet performance, the C850 Gold may provide better cooling due to its larger fan size, making it potentially more effective in larger builds.

Compatibility with Modern Graphics Cards

Both power supplies offer reliable power delivery for modern graphics cards, particularly the latest NVIDIA GeForce RTX 50 Series. The NZXT C850 Gold features a durable 12V-2x6 connector capable of providing up to 600 watts to these graphics cards, ensuring stability and efficiency for high-performance gaming. The C850 SFX Gold also includes the same robust 12V-2x6 connector with ATX 3.1 certification, highlighting its reliability for powering modern GPUs as well. However, the C850 SFX Gold's compact design may make it more suitable for systems with limited space.

Noise Levels

Noise levels can significantly impact the user experience, especially during intense gaming sessions. The NZXT C850 Gold's 135mm fan operates quietly under moderate loads, thanks to its Zero Fan Mode. In comparison, the C850 SFX Gold features a 92 mm fan with a Cybenetics A- noise rating, indicating efficient and quieter operation. While both power supplies prioritise low noise, the C850 Gold may have the edge in terms of airflow and cooling performance due to its larger fan.

Build Quality and Reliability

When it comes to build quality, both power supplies showcase high-quality components. The NZXT C850 Gold utilises 100% premium Japanese capacitors, which enhance hold-up time and minimise ripple noise, ensuring stable power delivery. Similarly, the C850 SFX Gold is designed for uninterrupted system performance, boasting low ripple noise and tight voltage regulation. Both models underscore NZXT's commitment to reliability, but the C850 Gold's focus on premium components may appeal more to users seeking long-term reliability in larger builds.

Which should you buy?

Choosing between the NZXT C850 Gold ATX 3.1 and the NZXT C850 SFX Gold ultimately depends on your specific needs. If you require a cost-effective solution that fits standard cases and offers excellent performance, the C850 Gold is a strong choice at £84.90. On the other hand, if you're working with a compact build and can justify the higher price of £129.98, the C850 SFX Gold provides superior efficiency and a space-saving design. Each model excels in its intended use, making your decision hinge on form factor preference and budget considerations.