NZXT C850 Gold ATX 3.1 review

The C850 Gold ATX 3.1 is an 850 W ATX 3.1 power supply from NZXT. It is fully modular and measures 150 x 86 x 160 mm. It targets a mainstream gaming or workstation build with one graphics card, rather than a multi-GPU rig.

The unit holds both 80 PLUS Gold and Cybenetics Gold ratings. Listed figures at 115 V are 85.8% at 10% load, 89.5% at 20%, 91.7% at 50% and 89.2% at 100%. The peak sits at half load. The 10% figure is the weakest of the set. For an always-on machine that idles at very low draw, that number matters more than the headline Gold badge. Note that these figures are measured at 115 V.

The fan is a 135 mm fluid dynamic bearing design with PWM control, rated at 2,300 RPM ±10%. NZXT lists a maximum noise of 44.5 dBA. A Zero RPM mode keeps the fan silent below 50% load. On an 850 W unit, that threshold sits at roughly 425 W. Under sustained heavy load the fan spins, and the 44.5 dBA ceiling is the figure to keep in mind for a build in a quiet room.

Fully modular cabling means only the cables you need go into the case. That helps airflow and tidiness in a compact chassis. The unit includes one 16-pin 12V-2x6 connector, which NZXT rates for up to 600 W, and three 8-pin (6+2) PCIe connectors. A native 12V-2x6 cable means a modern high-power card needs no adapter. With one 12V-2x6 and three 8-pin connectors, it suits a single-GPU build more than a system with several cards. The spec sheet gives no SATA or Molex connector counts, so check NZXT's product page if you plan to fit many drives.

NZXT doesn't publish the platform maker. The listed specifications don't include a breakdown of over-current, over-voltage, over-temperature or short-circuit protections, or ripple and voltage regulation figures. What the specifications do establish is the Cybenetics Gold rating, the ATX 3.1 designation and the 10-year warranty. A decade of cover is a long commitment from the manufacturer and gives some reassurance about durability. Buyers who want ripple and regulation data before committing will need to look for it elsewhere.

The 10-year warranty is the clearest strength here. A decade of cover suits a power supply you plan to keep in service for years. The cover length alone is a reason to shortlist it.

No recurring owner themes are available for this model, so the review rests on the manufacturer's specifications.

The C850 Gold ATX 3.1 suits builders who want a quiet, modular 850 W unit with a native 12V-2x6 cable and long warranty cover. Its three 8-pin PCIe connectors limit it for multi-GPU setups. Its efficiency is weakest at 10% load, at 85.8%. The 10-year warranty is the strongest part of the package.