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Corsair Professional Series Gold AX850 CMPSU-850AX 850W ATX Fully Modular 80PLUS Gold Power Supply

Corsair Professional Series Gold AX850 CMPSU-850AX 850W ATX Fully Modular 80PLUS Gold Power Supply - 1
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Corsair Professional Series Gold AX850 CMPSU-850AX 850W ATX Fully Modular 80PLUS Gold Power Supply - 53719_l.jpg Customer Photos (0)
Reg. Price: $229.98  CAD
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SKU: 53719
Shipping Weight: 8.6lbs

Part #: CMPSU-850AX

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Product Videos    [ Edit ]

Features    [ Edit | History ]

Unprecedented Power Protection

The Corsair Professional Series Gold power supply pushes the state of the art for reliable delivery of clean power under imperfect conditions. If you require mission-critical stability or you simply want one of the best power supplies available, the Professional Series Gold is for you.

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.

Corsair Professional Series Gold AX850 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
  • Universal AC input from 90~264V
    • No more hassle of flipping that tiny red switch to select  the voltage input!
  • 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
    • Power supply upgrade and replacement is easy, as the cables only need to be disconnected at the power supply
  • Low-profile, flat cable design reduces air friction and helps maximize airflow through your computer's chassis
  • A seven year warranty and lifetime access to Corsair's legendary technical support and customer service
  • Dimensions: 150mm(W) x 86mm(H) x 160mm(L)
  • MTBF: 100,000 hours
  • Safety Approvals: UL, CUL, CE, CB, FCC Class B, TÜV, CCC, C-tick

Specifications    [ Edit | History ]

Power Supply Specifications

AC Input 90-264V ~ 15A 50/60Hz
DC Output +3.3V +5V +12V -12V +5Vsb
Max. Current 25A 25A 70A 0.5A 3A
Max Combined Wattage 125W 840W 6W 15W
850 @ 50°C ambient temperature

Connectors Included

ATX 24 pin & 20 pin compatible

EPS/ATX12V 8-4 pin

PCI-E 6+2 pin


4 pin Peripheral


Corsair CMPSU-850AX Customer Reviews

Product reviews on are screened for relevance and inappropriate content. Reviews may contain inaccurate information about the product. If there is a discrepancy, please use the Flag this Review link located beside each review. Reviews are not an endorsement expressed by, but opinions from customers based on their own experience with a product. We do not recommend you make purchasing decisions based on facts or opinions expressed regarding Corsair CMPSU-850AX reviews.
Experience: 1 Years
Does exactly what it needs to. Comes with many cables for most types of connections the fan is not noticeable. Modular is the way to go for cable management.

Experience: 6 Months
- Fully modular
- Clean cable sleeves
- You can buy individual sleeved cables in different colors off the Corsair website!
- Fan only goes on when needed
- A little bit on the pricey side, but for what you get, it's worth it!
Had this for 6 months running an i7 3770k overclocked to 4.5Ghz and running 2 GTX 660s in SLI. It's still pumping juice into my rig very well and doesn't waste power by having the fan on un-necessarily. Great PSU!

Experience: 2 Months
 Verified Owner
Quiet, reliable, affordable
Awesome PSU. Very easy to install and easy to keep things looking neat and tidy. Plenty of power for everything and then some, it's definitely the best 850w power supply in my experience. It's quiet and runs perfectly well, would definitely recommend.

Experience: 2 Years
Awesome PSU, over two years of use and still going strong!!
Killer PSU. I have put this modular power supply through a lot of abuse and use and it is still kicking strong!! Probably the best power supply I have ever purchased. Thanks NCIX!

Experience: 1 Weeks
 Verified Owner
Very quiet
Good quality
Fully modular
7 year warranty
Connecting cables can be confusing at first.
Awesome power supply. Thanks NCIX!

Experience: 1 Months
 Verified Owner
Good quality of power supply and cables
Good for SLI system
Very quiet
Fair price
1.This PS is for people who want to DIY the cables. It's a good idea not to make the case messy. Corsair makes a good product again!

2.I have 2 GTX670's (which beat 1 GTX690), and 850 gives me enough power to run the whole system.

You don't need to worry about the length of cables, they are long enough to be connected with your MB. (My case is Cooler master HAF XM)

This review was modfied by poster @ 12-28-12 03:32 PM

Carbon Rod
Experience: 2 Years
 Verified Owner
Single rail design. Solid power. 80+ Gold efficiency. Fully modular. Very quiet. Seasonic design in Corsair colors.
If you don't get it on sale, it does feel a bit pricey.
I bought my first AX850 a couple years back and it's still going strong. What originally drew me to it back then was the fact that it was an extremely well built single rail design, very efficient, and extremely quiet. I now own a number of these powering a variety of different systems including a dual processor Opteron 6180SE server.

If you need a solid 850 watt PSU, look no further!

Experience: 1 Weeks
 Verified Owner
Efficient, small, powerfull, really well built and silent
Mot really
Want a small body power supply but still able to run my HD6970 crossfire to replace my Silverstone D850. The DA850 is a great psu but for my project a need the smallest 850w.
And the AX850 being a 80+ Gold make it even better n 169$

So i really like it !

Experience: 7 Days
 Verified Owner
- Quality
- Efficiency
- Customer Service
- Price
I got this at a good price with PM, and with that I was extremely happy. Otherwise the unit is very well build and the cables are good. It powers everything, so I can't complain!

Experience: 4 Weeks
 Verified Owner
Capable PSU
Decent price
Modular PSU
Lots of cables!
Great PSU for a great price. You can't go wrong with Corsair's PSU product line. Would of went for the 1200AX, but I wasn't that trigger happy.

850W is more than you'll ever need (relatively speaking of-course)

 NCIX Forum Messages

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Messages about Corsair Professional Series Gold AX850 CMPSU-850AX 850W ATX Fully Modular 80PLUS Gold Power Supply

This or Seasonic X850? (wiglet- Jan 06, 12, 8 Replies) Read this message
RE Buzz... (JAWSOPTER- Dec 19, 11, 3 Replies) Read this message
Extra Modular Cables (Zer0- Nov 23, 11, 12 Replies) Read this message
Corsair AX850 - Two dead hard drives (J.G- Jul 10, 11, 1 Replies) Read this message
CMPSU-850AX vs CMPSU-850AXA (Dominic_V- Apr 21, 11, 1 Replies) Read this message
Buzzing sound (lokshun_k- Apr 01, 11, 3 Replies) Read this message
Corsair ax850 ac input plug (zeakman- Mar 31, 11, 7 Replies) Read this message
stock? (Michael_P- Mar 28, 11, 2 Replies) Read this message
Corsair AX850 or Coolermaster Silent Pro 850W (Paul_T- Mar 17, 11, 5 Replies) Read this message
Short cables on this PSU (Todd™- Mar 17, 11, 5 Replies) Read this message

Post a New Message  |    All Messages       Browse NCIX Forums

Forum messages are not reviewed and may not contain accurate information about a product. Message contents are opinions from customers based on their own experience with a product. We do not recommend you make puchasing decisions based on Forum messages.
Reviews from the Web

Below are reviews found on other web sites for this product submitted by customers.

Comment: "We expected to feel let down by the AX850 after our great experience with the AX1200 but in the end we were equally impressed by the lower specification model. In fact in some respects, such as the cooling fan performance, it is more impressive than the high end unit. Corsairs exceptional range of
Posted by: Richard_H @09/04/11
Comment: The Corsair AX850 is ideal for a new cateory of PC enthusiast that has emerged in the last couple of years: Silent Gamers. It is a winning power supply in every way — electrical performance is tops, efficiency is high enough for 80 Plus Gold, the build quality is fantastic...
Posted by: Jello_D @09/01/11
Comment: "...if you are the kind of user that only wants “the best in class”, then the Corsair AX850W is the 850 W power supply that you should buy"
Posted by: Comfortably Numb @11/12/10
Comment: 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 effect
Posted by: supaaninja @10/22/10
Comment: Corsair has quickly become one of the computer hardware enthusiast's favorite power supply brands by building and designing some of what have become the best PSUs in the world. Does the new 850 watt AX850 stand up to the already high bar set by Corsair? Short Answer, YES!
Posted by: David_B @10/07/10
Comment: A winning power supply — electrical performance is tops, efficiency is high enough for 80 Plus Gold, the build quality is fantastic, the completely detachable cables are a breeze to work with.
Posted by: BernardP @09/27/10
Submit a review link   |   Latest 30 reviews
Product Warranty
First 30 days limited warranty through The remainder of the 3 year warranty is provided directly by the manufacturer.

Corsair's DRAM memory modules all carry a lifetime warranty. The Flash Voyager, Flash ReadOut, TurboFlash, Flash Survivor and Mini Flash products all have a warranty for the expected normal life of the product (10 years). The Flash Padlock has a warranty of 3 years. The HX, TX, and VX Series of Power Supplies have a 5 year warranty, and Liquid Cooling products carry a one year warranty. In general, this means Corsair products are guaranteed to operate, as specified by their datasheet, and in the operating environment for which they were intended, for the life of the product or the extent of the warranty.

For additional information and technical assitance, please visit Corsair Memory's support site at:

Corsair Technical Support

Phone:  1-800-205-7657

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While uses all reasonable efforts to include accurate and up-to-date information on the Site, makes no warranties or representations as to the Site's accuracy. assumes no liability or responsibility for any errors or omissions in the content on the Site. warrants product(s) to be in good working condition and free from defects in material and workmanship for a period of one (1) year for OEM packages, and for thirty (30) days for RETAIL packages (excluding laptops and notebooks), from the original Invoice date unless otherwise restricted below or by the manufacturer's own warranty policy. Defective returns and warranty service will be replaced, exchanged or repaired at's sole discretion, and based on vendor's policy.

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GOVERNMENT & BUSINESS Laptop and Notebook purchases made with government or business POs can be returned typically within fourteen (14) days from original invoice date. Return will only be accepted with original packaging, accessories, cables, free gifts (if applicable), unopened software and manuals and is subject to inspection before warranty approval. Laptop and notebook with tampered serial numbers or UPC code will be denied returns. Please check with your B2B sales representative for specific terms and details.

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