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 System
All 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 cables stay in place and connect to your new fully-modular Corsair power supply.
Incredible Efficiency
With 90% efficiency at 50% load, the Corsair Professional Series Gold power supply runs quieter, generates minimal excess heat, and saves you money every month. It's earned the 80 Plus Gold seal of approval, your guarantee that you're making the right choice for smart, efficient power delivery.

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 Corsair's renowned quality standards to provide enthusiasts with the one of the highest-quality 850 watt PSU available.
Product Features
Supports the latest ATX12V v2.31 and EPS 2.92 standards and is backward compatible with ATX12V 2.2 and ATX12V 2.01 systems

An ultra-quiet 120mm double ball-bearing fan delivers excellent airflow at an exceptionally low noise level by varying fan speed in response to temperature

80 PLUS Gold certified to deliver at least 90% efficiency at 50% load

Active Power Factor Correction (PFC) with PF value of 0.99

A dedicated single +12V rail offers maximum compatibility with the latest components

Over-voltage and over-current protection, under-voltage protection, and short circuit protection provide maximum safety to your critical system components

High-quality Japanese capacitors provide uncompromised performance and reliability

Completely modular cable system allows you to use only the cables you need

Low-profile, flat cable design reduces air friction and helps maximize airflow through your computer's chassis

Safety Approvals: UL, CUL, CE, CB, FCC Class B, TÜV, CCC, C-tick
What the Experts are Saying...
"In terms of performance Corsair continues to exceed our expectations with their Professional Gold Series. Corsairs exceptional range of power supplies just received another fantastic model and it appears they really can do no wrong in the PSU market." - HardwareHeaven August 19, 2010
"Computer power supplies have come a long way in just the last couple of years. With the implementation of resonant mode topologies and DC to DC converters for non-primary DC output, we've seen efficiency increase more and more. The AX850 is an example of how to implement these features as effectively as possible by avoiding the high ripple typically associated with resonant mode topology and the poor voltage regulation typically associated with DC to DC converters under load." - JonnyGuru August 26, 2010
"How best to put this......the Corsair AX850 is an outstanding entry into the 850W segment that's only real competition, that we have reviewed and is readily available at this time, is the Corsair HX850. The single best, and most distinctive, feature of the AX850 is not its efficiency as the unit's marketing and color scheme may indicate, but rather the unit's amazing DC Output Quality." - HardOCP October 7, 2010
Corsair Professional Series - Specifications Specifications AX750 AX850 AX1200 Wattage Output 750 850 1204 Efficiency 80+ Gold 80+ Gold 80+ Gold Hybrid Silent Fan Control Yes Yes No +12V Rating 62 Amps 70 Amps 100.4 Amps Continuous Power Output 750 Watts @ 50°C 850 Watts @ 50°C 1204 Watts @ 50°C Warranty 7 Years 7 Years 7 Years Size 150mm(W) x 86mm(H) x 160mm(L) 150mm(W) x 86mm(H) x 160mm(L) 150mm(W) x 86mm(H) x 200mm(L) Power Supply Image More Information
EfficiencyFan NoiseWhy choose a Corsair Professional Series AX power supply?Incredible EfficiencyWith 90% efficiency at 50% load, the Corsair Professional Series Gold power supply runs quieter, generates minimal excess heat, and saves you money every month. It's earned the 80 PLUS® Gold seal of approval, your guarantee that you're making the right choice for smart, efficient power delivery.
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 cables stay in place and connect to your new fully-modular Corsair power supply.
7 Year WarrantyCorsair strives to ensure the quality and reliability of our power supplies, which is why the Corsair Professional Series Gold power supplies are provided with a seven year limited warranty. They are also backed by Corsair's legendary customer service and technical support.
Connectors and Cable Length Connector Type Quantity Length (mm) Length (inches) Connectors per cable ATX Power Cable 1 600mm 23.62" 1 EPS/ATX12V CPU Cable 2 600mm 23.62" 1 PCI-E Cable (6+2 pin) 2 600mm 23.62" 2 SATA Cable 2 850mm 33.46" 4 SATA Cable 2 600mm 23.62" 2 Peripheral Cable 2 850mm 33.46" 4 Floppy Adapter 2 100mm 4" 1