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Corsair CX Series 400W ATX2.2 Power Supply

Stock may vary from item pictured. Retail pictures do not guarantee retail products.


All Corsair power supplies are 80+ certified and feature continous power out. Built from the highest quality internals making them ideal for overclockers and gamers.

This item is currently discontinued and at present, we have no replacement on order.
Quickcode: 34003  
Stock code: POW-200449-CMPSU-400
Manuf. code: CMPSU-400CX
Cust. Rating:   Read reviews.
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The Corsair Power CX400W delivers worry-free compatibility for your home system build or desktop upgrade, with features usually reserved for premium power supplies.
The affordable Corsair Power CX400W is not your basic power supply. It features a thermally-controlled 120mm fan for whisper quiet operation and active power factor correction circuitry for clean, reliable power output. The extra long, sleeved cables allow easy integration into a wide variety of cases, and the large number of connectors assures compatibility with nearly all components.

Warranty Information:

Manufacturer corsair
Warranty Type Aria Warranty Only
Manufacturer Website
Warranty Period (yrs)5

Comments, Questions & Reviews:

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Question  Question by MPT

Can you please confirm that "power 8 pin EPS12V with detachable 4 pin ATX12V section" is a suitable connection for a CPU with an 8pin connector rather than 4pin

Answer by gavin on Monday, September 13, 2010
Yes, it's an 8 pin connector that can be split into a 4 pin as well.

Question  Question by ben

Do you think this PSU will be powerful enough for the following items?

5750 1024MB GPU
Asus M4A77T mobo
Athlon II X4 Quad Core 635 2.90GHz
4GB 1333MHz RAM
+ 500GB HDD + DVD drive

Or maybe I should get a 500W PSU?

Answer by gavin on Thursday, September 9, 2010
I'd recommend a 500W PSU at least.

Read this review site by Ian

According to Hardware Secrets this is a cracking little PSU that can quite easily supply 450watts and has very long power connectors with 2 SATA on each of 3 lines; something much more expensive models from other makes could do with!!

 true 400watts by bluechill1

hi, ive been in the computer and tv traid for 15years, im running 3gig duo, 8800gt also raid 0 x 2 satas with hardware controller card other cards including freesat.
power supply doesnt get warm of do anything it should'nt but later i installed an ati4870 and i guessed that no cance it would run or even post. well i was wrong perfect just very light warm air from pc, bench tested full 24hours and perfect.
this psu offers true 400watts and thats a fact!!!!

391 of 797 people rated this review as helpful

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Question  Recommended PSU for my pc by Phil

What PSU would you recommend for my pc please, would the corsair 400W be sufficient? (I do not want to spend more than £40, preferably even less but the cheaper ones do not seem as good quality)...I would also like one that could handle a better graphics card.

Gainward bliss 7900GT 512mb
2gb ocz 667mhz ddr2 ram
asus p5n-e sli mobo
1TB samsung spinpoint (sata II HDD)
500gb external HDD

Thanks. (Under £40 please!)

Answer by stevenl on Thursday, November 5, 2009
With those components, i would recommend one of these instead: #37544.
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