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COOLMAX CX-400B 400W ATX v2.01 Power Supply

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  • ATX v2.01
  • 115 / 230 V 50/60 Hz
  • +3.3V@20A, +5V@18A, +12V1@18A, +12V2@16A, -12V@0.5A, +5VSB@2.5A

  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews

The Coolmax CX-400B Power Supply is compliant with the ATX12V version 2.0 standard, and offers dual 12V outputs for stable power delivery to all your components. The cable-tube on the main power cables offers better cable routing and neatness. Over Voltage Protection and Overload Protection keep your system intact from power mishaps.

 

  • newegg ATX12V Compliant Compliant with the ATX12V v2.01 standard, the Coolmax CX-400B Power Supply provides the maximum power stability to drive leading Intel and AMD processors, as well as other components.
  • newegg Silent 120mm fan The Coolmax CX-400B features a built-in 120mm silent fan for whisper-quiet cooling.
  • newegg Tied cables for a tidy look! The cable-tube on main power cables provides better cable management and a neat look.

Learn more about the CoolMax CX-400B

Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 1 year
  • Limited Warranty period (labor): 1 year
  • Read full details
  • Return Policies
    • Return for refund within: 30 days
    • Return for replacement within: 30 days
  • This item is covered by Newegg.com's Standard Return Policy.
Ownership: 1 month to 1 year
Verified Owner
1/ 5
JUNK 5/18/2015 8:13:06 AM

Pros: price with rebate

Cons: only worked for 40 days then fryed, just long enough to be stuck with it. junk do not buy!!!!!!!!!!!!!!

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Anonymous
Ownership: more than 1 year
Verified Owner
4/ 5
Did the job 4/29/2014 9:32:10 AM

Pros: Powered my cheap HP computer after I upgraded the graphics card beyond the stock psu handling.

Cons: this was a good psu to upgrade a stock unit in an HP computer. I wouldnt recommend this for a custom build.

Did you find this review helpful?
Ownership: 1 month to 1 year
Verified Owner
2/ 5
Overrated Junk (275W PSU) 3/17/2014 6:20:29 PM

Pros: Coolmax has been "updating" this model of PSU, but mostly downgrading it further. It does have some pros though...barely.

It uses a nice quality fan, and even though it's wired straight to the 12V all the time (No thermal fan control whatsoever) it stays quiet, and the bearing has plenty of grease so it shouldn't fail.

The older revision of this PSU used the infamous two transistor circuit for the +5VSB, which wasted a lot of electricity and killed lots of motherboards. They updated it with an 8 pin IC to generate the +5VSB which is a lot more efficient and isn't prone to frying your motherboard.

Cons: Everything else... The old revision (Circa 2009) could pump out about 350W, this one is capable of about 275W (With a very mixed rail load).

It claims two 12V rails capable of 348W. HA! It only has one rail, and it uses a 16A ultra fast rectifier. Since the fan runs fast keeping it cool, I bet it could do the full 16A, but that's only 192W...Almost 90% of your computer uses the 12V. That makes this basically a 200W PSU in a modern system. And if you load it up, that 12V rail is going to sag quite a bit...

Overall Review: Don't give these guys your money, they don't deserve it.

3 out of 3 people found this review helpful. Did you?
Anonymous
Ownership: less than 1 day
Verified Owner
2/ 5
Loud, no fan switch as advertised. 11/6/2013 8:21:23 AM

Pros: It worked for the 30 minutes that I used it...very loudly.

Cons: The box advertises a fan switch, and the unit pictured on the box shows on. This switch is missing from the actual unit, and the thing sounds like a jet engine with the PC mounted in the computer desk. It's literally intolerable. Fix the packaging and don't advertise a switch that isn't there.

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Ownership: 1 day to 1 week
Verified Owner
5/ 5
One Rebate 9/24/2013 11:44:03 AM

Pros: Looks like it will be ok have yet to use.

Cons: Don't count on buying multiple PS with rebate it says one rebate, item household. Even though the limit to buy was 5

0 out of 2 people found this review helpful. Did you?
Ownership: 1 day to 1 week
Verified Owner
3/ 5
works, lack of parts provided 7/12/2013 10:44:09 PM

Pros: It works thus far

Cons: This power supply came without a power plug, which to me seems extremely cheap of the manufacturer, luckily i had plenty of extras

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Ownership: more than 1 year
Verified Owner
2/ 5
Needs lubrication 11/13/2012 10:07:35 PM

Pros: I bought two units and both have been working fine for years. The units are very quiet if they don't need lubrication. They worked after the hurricane Sandy, when some other PSUs refused to turn on, probably due to flaky mains power.

Cons: Both units became noisy after a few years of use. I had to open both of them and lubricate the fans with garage door lubricant. Both are quiet again. The device shows its age. Who needs so many molex and floppy connectors? And 2 SATA connectors are not enough for anything beyond the simplest setup (one hard drive and one optical drive).

Overall Review: I have other power supplies that have been working for years quietly, without requiring to be lubricated. I cannot recommend this unit to anyone.

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Ownership: more than 1 year
Verified Owner
2/ 5
This one died long ago 10/8/2011 9:37:42 PM

Pros: It was a good PSU

Cons: Too bad it died and took my mobo and RAM with it!

1 out of 4 people found this review helpful. Did you?
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  • New : This means the product will ship as received by the manufacturer, sealed, with all advertised components, and with the manufacturer warranty.
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  • Used - Good : This means that the product has been used, may show clear signs of use and may be missing minor accessories, but remain in good condition. Product does not come with warranty unless stated otherwise in product description.
  • Used - Acceptable : This means that the product shows clear signs of use, cosmetic defect, and may be missing minor accessories and manual, but remain in working condition. Product does not come with warranty unless stated otherwise in product description. Functionality issues beyond signs of use should be disclosed in product description.
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