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Item#: N82E16817159023
COOLMAX CX-400B 400W ATX v2.01 Power Supply
  • ATX v2.01
  • 115 / 230 V 50/60 Hz
  • +3.3V@30A, +5V@28A, -5V@1A, +12V1@14A, +12V2@15A, -12V@1A, +5VSB@2.5A
  • $38.99
  • $2.99 Shipping (restrictions apply)

2 out of 5 eggs Overrated Junk (275W PSU) 03/17/2014

This review is from: COOLMAX CX-400B 400W ATX v2.01 Power Supply


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.


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...

Other Thoughts:

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

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  • David C.
  • Verified Owner
  • Owned For: 1 month to 1 year

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Item#: N82E16817159023
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