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Corsair Professional Series AX 850 Watt ATX/EPS Modular 80 PLUS Gold (AX850)

Corsair Professional Series AX 850 Watt ATX/EPS Modular 80 PLUS Gold (AX850)

Bottom line: The Corsair Professional Series AX 850 Watt ATX/EPS Modular 80 PLUS Gold: Fully modular cabling lets you install only the cables your build needs; main trade-off: older Professional Series design predates 12VHPWR/ATX 3.x connectors.

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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

  • ✓ Fully modular cabling lets you install only the cables your build needs
  • ✓ 80 PLUS Gold certified, up to 90% efficiency at real-world loads
  • ✓ Seven-year warranty plus lifetime Corsair technical support
  • ✓ Japanese capacitors throughout for long-term reliability
  • ✓ 850W headroom sized for high-end multi-GPU gaming rigs

Cons

  • ✗ Older Professional Series design predates 12VHPWR/ATX 3.x connectors
  • ✗ Listing omits dimensions, so depth clearance in small cases is unverified
  • ✗ Double ball-bearing fans typically hum more than fluid-dynamic designs
  • ✗ No published connector or rail breakdown to check against a build list

Manufacturer description

The Corsair AX850 power supply offers 80 PLUS GOLD levels of energy-efficiency, and the power needed for high-end, multi-GPU gaming PCs. It is built to the highest quality standards to provide enthusiasts with the highest-quality 850W PSU available.A Fully Modular Cabling SystemAll cables detach from the power supply. During installation, this gives you the flexibility of using only the cables you need for a clean system build with optimal airflow. And, when it's time to replace or upgrade your power supply, it can be removed from your system without interfering with your cabling - the…

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SpecPicks Verdict

SpecPicks scored Corsair Professional Series AX 850 Watt ATX/EPS Modular 80 PLUS Gold using a rating × review-volume × price-fit model applied to published specs and reviews across the power supplies category. Compare with similarly-priced alternatives in the power supplies category before committing. 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

  • An ultra-quiet double ball-bearing fan delivers excellent airflow at an exceptionally low noise level by varying fan speed in response to temperature.
  • A Seven year warranty and lifetime access to Corsair's legendary technical support and customer service.
  • 80PLUS Gold certified, delivering up to 90% energy efficiency at real world load conditions.
  • High-quality Japanese capacitors provide uncompromised performance and reliability.
  • 80PLUS Gold certified, delivering up to 90% energy efficiency at real world load conditions.
  • A Seven year warranty and lifetime access to Corsair’s legendary technical support and customer service.

Full Specifications

BrandCorsair
Wattage850
Fan Size12 centimeters
Model NameCMPSU-850AX
Unit Count1 Count
Form FactorATX
Model NumberCMPSU-850AX
Connector TypeFloppy, SATA
Cooling MethodAir
Number of Fans1
Output Wattage750 watts
Item Dimensions10 x 6 x 4 inches
Mfr Part NumberCMPSU-850AX
Number of Items1
Compatible DevicesPersonal Computer
Power Supply DesignFull Modular
Warranty DescriptionSeven Years
Maximum Input Voltage240 volts_of_alternating_current
Minimum Input Voltage100 volts_of_alternating_current
Item dimensions L x W x H10 x 6 x 4 inches

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Corsair Professional Series AX 850 Watt ATX/EPS Modular 80 PLUS Gold (AX850) 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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Corsair Professional Series AX 850 Watt ATX/EPS Modular 80 PLUS Gold (AX850)
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