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Corsair CMPSU-400CX 400CX 400W ATX 12V 30A Power Supply Active PFC 120mm Fan

Corsair CMPSU-400CX 400CX 400W ATX 12V 30A Power Supply Active PFC 120mm Fan - 1
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Corsair CMPSU-400CX 400CX 400W ATX 12V 30A Power Supply Active PFC 120mm Fan - 33357_l.jpg Customer Photos (0)
Reg. Price: $74.99  CAD
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SKU: 33357
Shipping Weight: 4.8lbs

Part #: CMPSU-400CX

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Product Videos [ Edit ]

Features [ Edit | History ]

Quick Specs:
  • Intel Systems
  • AMD Systems
Input Voltage 110 V AC 220 V AC
Output Power 400 W
Height 3.4"
Width 5.9"
Depth 5.5"
Number of Fans 1

Specifications [ Edit | History ]

General Information  
     Brand Name: Corsair
     Manufacturer: Corsair
     Manufacturer Part Number: CMPSU-400CX
     Manufacturer Website Address:
     Product Model: CMPSU-400CX
     Product Name: CMPSU-400CX ATX12V Power Supply
     Product Type: ATX12V Power Supply
     Additional Information:
  • Uses less power and improves performance
  • Unparalleled Value: Legendary Corsair reputation, performance and quality

  • Intel Systems
  • AMD Systems

Physical Characteristics  
     Depth: 5.5" (139.7 mm)
     Height: 3.4" (86.4 mm)
     Width: 5.9" (149.9 mm)
Power Description  
     Input Voltage: 110 V AC
220 V AC
     Input Voltage Range: 90 V AC to 264 V AC
     Output Power: 400 W
     MTBF: 100000 Hour
Technical Information  
     Number of Fans: 1
     Power Factor Correction (PFC): Active
     Protection Type: Over Power
Over Current
Over Voltage
Short Circuit
Under Voltage

Customer Reviews of Corsair CMPSU-400CX

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-400CX reviews.
Experience: 1 Months
Verified OwnerVerified Owner


Really good psu when on sale.
Better quality supplies around this price point. It's not modular. 4 pin connector was short for a mid tower case.
A good psu. I have not experienced any coil whine. Bought it half price during a sale. 4 pin connector was a bit too short for routing in a mid tower case. It's not modular, so I had extra wires in my case.

Experience: 2 Years


Good price.
I used this PSU in my dads comp, and it died after a couple years, I was very surprised, corsair products are usually great.

Experience: 3 Weeks
Verified OwnerVerified Owner


great basic PSU, provides very stable power and has more than enough connectors for me.

Experience: 1 Weeks
Verified OwnerVerified Owner


not to loud
Bought on sale to replace the psu that fried in one of the old hp computers we have, working great.

Experience: 1 Months
Verified OwnerVerified Owner


looks very sleek with good cables
inherent problem with this model (buzzing noise)
Overall it's a good power supply but after a little research I found out that this model is very common to have a coil whine (which I have).

Experience: 2 Months
Verified OwnerVerified Owner


Its Corsair
80 Plus certified
Non modular (tho its cheap, didn't expect it to be)
Bought this to replace a friends dying PSU. It has worked perfectly since day 1, and my friend is no longer having computer problems. Its also a Corsair so you know you are getting a quality item.

Experience: 1 Weeks
Verified OwnerVerified Owner


-Black, sleek.
-Large fan
-Not too loud
-Only 400w
I used this to replace my uncles 460w cooler master that failed. I am grateful that I could find something for 30$ that suited his needs. Its pretty good looking too, with a nice lower 120mm fan intake. I am a fan of the design. This is the perfect piece to add to any budget, non-gaming build.

Experience: 90 Days


+ Looks nice
- 4 out of 7 died within 1 week of installing.
- 1 killed an SSD
- I wanted to make this a 1-star review however they were in-store purchases.
I build & repair computers for a living. Never in my life have I seen such a terrible computer component. Out of an order of 7, 4 f these died with 1 week of installation, causing great headache to myself my clients and my staff. We have been using Corsair power supplies without issue for years, but this CMPSU-400CX model will definitely never be used again. Another 2 power supplies have not yet been used, so their fate I do not yet know.


Experience: 2 Weeks
Verified OwnerVerified Owner


Bought it on sale
Short length
Looks sharp in my black case
for a non modular, low wattage, high efficiency PSU...None
I put this in my WHS 2011 build. Since it doesn't need to power much and will be turned on 24/7 I insisted on getting a lower wattage PSU for efficiency. The cables are easily tucked away, fan is quiet, everything is black and looks good with my Lian li Q25B mITX case.

Experience: 2 Months
Verified OwnerVerified Owner


Good price
Good performance
I bought it for a friend 2 months ago for his new desktop. It works as expected and has a good price/performance, couldn't go wrong with Corsair if you're looking for a decent PSU.

NCIX Forum Messages

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Messages about Corsair CMPSU-400CX 400CX 400W ATX 12V 30A Power Supply Active PFC 120mm Fan

This or Seasonic SS-400ET (Veer_G- Nov 26, 11, 12 Replies)
WILL THIS POWER MY SETUP? (Anthony S- Jul 22, 10, 4 Replies)
buzzing sound in sync with HDD activity status? (Kevin_W- Jul 21, 10, 0 Replies)
enough power for a 5750? (Quang_N- Jun 10, 10, 2 Replies)
can this run an 8800GT ? (qewcool- May 27, 10, 3 Replies)
thuban (ChaosphereIX- May 21, 10, 2 Replies)
Can I modify this to work with a car stereo? (Ryan_W- Apr 03, 10, 2 Replies)
How quiet? (Sandwich- Jan 20, 10, 5 Replies)
My experiences with the 400CX (JJHiew- Jan 06, 10, 16 Replies)
Shipped with Incorrect IEC (bond_bbs- Jan 01, 10, 0 Replies)
CMPSU-400CX PS connectors clarification (Xurbax- Dec 08, 09, 1 Replies)
Which one? (phoedrus d- Dec 03, 09, 5 Replies)

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: Corsair CX400W is an excellent product for the regular user that is building a PC with just one video card.
Posted by: dave_k @08/03/09
Comment: There are power supplies such as the Corsair CX400W that didn't stick out too much during testing but still offer a very attractive price tag. If you do have only around $50 to spend on a power supply we suggest you have a closer look at the Corsair CX400W, or the OCZ ModXStream Pro with 400W if
Posted by: Zenphic @01/20/09
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
[email protected]

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