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NZXT C850 Gold ATX 3.1-850W Fully Modular Power Supply | 850W 80 PLUS Gold ATX 3.1 PSU, fully modular and quiet. PCIe 5 ready for modern GPUs, backed by a 10-year warranty.
NZXT

NZXT C850 Gold ATX 3.1-850W Fully Modular Power Supply

Bottom line: The NZXT C850 Gold ATX 3.1-850W Fully Modular Power Supply: ATX 3.1 with 12V-2x6 connector pushes up to 600W to RTX 40 Series GPUs; main trade-off: 850W ceiling limits headroom for dual-GPU or heavily overclocked rigs.

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By , Founder & Editor-in-Chief · Listing data updated

Mike Perry — Hardware researcher since 2014, focused on GPU performance across gaming, rendering, and local-LLM inference. Synthesises community benchmarks, manufacturer specs, and public forum data into actionable buying guides.

Pros & Cons

Pros

  • ✓ ATX 3.1 with 12V-2x6 connector pushes up to 600W to RTX 40 Series GPUs
  • ✓ Fully modular cabling for cleaner builds and improved airflow
  • ✓ 135mm fluid dynamic bearing fan runs silent in Zero Fan Mode under 50% load
  • ✓ 100% Japanese capacitors for low ripple and longer hold-up time

Cons

  • ✗ 850W ceiling limits headroom for dual-GPU or heavily overclocked rigs
  • ✗ 80 Plus Gold, not the higher Platinum or Titanium efficiency tier
  • ✗ Cybenetics A- noise rating falls short of the top A+ class
  • ✗ Zero Fan Mode only engages below 50% load, so the fan spins under heavier draw

Manufacturer description

NZXT C850 Gold ATX 3.1 (PA-8G2BB-US) - Fully Modular Low-Noise PC Gaming Power Supply - 850 Watts - 80 PLUS Gold - 12V-2x6 Connector - Zero Fan Mode - 100% Japanese Capacitors - Black

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SpecPicks Verdict

SpecPicks scored NZXT C850 Gold ATX 3.1-850W Fully Modular Power Supply using a rating × review-volume × price-fit model applied to published specs and reviews across the power supplies category. NZXT's power supplies lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for power supplies of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Key Features

  • ATX 3.1 — Compliant with the ATX 3.1 standard to fuel high-performance PC components with stability, efficiency, and power spike resistance.
  • 40 SERIES READY — Durable, heat-resistant 12V-2x6 connector pumps up to 600 watts to NVIDIA GeForce RTX 40 Series graphics cards.
  • HIGH EFFICIENCY, LOW NOISE — Awarded certifications of 80 PLUS Gold Efficiency, Cybenetics Gold Efficiency, and Cybenetics A- Noise Level.
  • ULTRA-LOW NOISE FAN — 135mm fluid dynamic bearing fan with Zero Fan Mode is completely silent when under 50% load.
  • HIGH-QUALITY CONSTRUCTION — 100% premium Japanese capacitors improve hold-up time and minimal ripple noise, ensuring reliable and stable power delivery.

Full Specifications

BrandNZXT
Wattage850 watts
Fan Size13.5 centimeters
Model NameNZXT C850 Gold ATX 3.1
Unit Count1 Count
Form FactorATX
Model NumberPA-8G2BB-US
CompatibilityPC
Built-In MediaNZXT PS PA-8G2BB-US 850W ATX3.1 80Plus Gold Fully Modular Black Retail
Connector TypeATX
Cooling MethodAir
Number of Fans1
Output Wattage850
Item Dimensions6.3 x 5.91 x 3.39 inches
Mfr Part NumberPA-8G2BB-US
Number of Items1
Number of Packs1
Compatible DevicesDesktop PC
Power Supply DesignFull Modular
Warranty Description10 year manufacturer
Full listing titleNZXT C850 Gold ATX 3.1-850W Fully Modular Power Supply | 850W 80 PLUS Gold ATX 3.1 PSU, fully modular and quiet. PCIe 5 ready for modern GPUs, backed by a 10-year warranty.

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NZXT C850 Gold ATX 3.1-850W Fully Modular Power Supply | 850W 80 PLUS Gold ATX 3.1 PSU, fully modular and quiet. PCIe 5 ready for modern GPUs, backed by a 10-year warranty. is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

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NZXT C850 Gold ATX 3.1-850W Fully Modular Power Supply | 850W 80 PLUS Gold ATX 3.1 PSU, fully modular and quiet. PCIe 5 ready for modern GPUs, backed by a 10-year warranty.
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