Sub-$75 Mainstream Power Supply Roundup

Corsair CX400W: Measurements

Efficiency meets 80 PLUS requirements:

Efficiency under different load profiles:

The Corsair CX400W lives up to the 80 PLUS certification conditions, though it only just manages to reach the minimum requirement of 80% efficiency at 20% and 100% of the maximum 115 V load.

At 230 V, the results are naturally a bit higher. Its efficiency does deteriorate rather severely under light loads, though. At 25 W, it is just 69% (115 V) and 70% (230 V) respectively.

Other measurement results are loosely within the ATX specifications, and the hold-up time of 35 ms is particularly good. The very low temperature increase of just two degrees under load is also noteworthy. However, the CX4000W does have the highest inrush current of all the tested PSUs, with more than 63 A at 230 V.

Create a new thread in the UK Article comments forum about this subject
This thread is closed for comments
Comment from the forums
    Your comment
  • mi1ez
    1) Stop moaning about PSU.s that aren't available in the US.
    2) Where are the actual voltages for each rail? It feels like most of this test is missing!
  • swamprat
    I can't say I've read every page - but are there noise readings anywhere as well as the occasional comment like "it's quiet"?
  • Anonymous
    Small PSU means desktop/media.... and since the conclusion was "they're all pretty similar" then noise is going to be one of the main selection criteria. So... no real help in choosing :(
  • stone-69
    Uhm... just a newbie question :
    Are cheap PSUs really that bad ?
    I mean I've seen a lot of people basically saying that a cheap PSU will make your PC explode (or something along that note), but I've seen very few thorough reviews of cheap PSUs testing ripple, noise and voltage drops.
    Could this be an idea for a future article ?