Enermax Liberty ECO 500w ATX PSU



Enermax Liberty EC 500wAs we continually stress to our forum members here at Overclock3D: "500w is more than enough power for almost all PC systems providing you pick a good PSU". Judging by the results we've seen today that's exactly what the Enermax Liberty ECO 500w is: a very good PSU.

During testing the Liberty ECO managed to hold some extremely tight voltages across all of its rails, with the +12v lines only dropping by 0.13v from idle to full load. Both the +3.3v and +5v rails also maintained good stability with a drop of 0.06v and 0.12v respectively. Only when applying a heavy crossload to the unit did things start to get a bit out of hand in Test 5 with the +12v rails shooting up to around 12.8v. However, as I've said many times before, this isn't a situation that you are likely to ever come across on a normal PC, so it's hard to give the Liberty ECO negative marks for this result alone.

Efficiency was also extremely reasonable with 84-85% being achieved under most loads. Sure there are PSU's out there capable of maintaining 88-90% efficiency, but at present these units are extremely expensive - and let's face it, it's not until you start sucking really large amounts of power from the wall socket that a 3% efficiency difference would actually be noticeable.

Finishing off with the scope results conducted while the PSU was roasting away in our 50°C oven, I think its fair to say that these were outstanding. Ripple on the +12v rails never exceeded 20mV even when at full load, and similarly the results from the +3.3v and +5.0v were also among the lowest I've ever seen. Amazing.

At time of writing the Liberty ECO is only available at a limited number of UK based retailers. Scan is one of these few and has the 500w model listed at £85.47. This in all fairness, is at the top end of the scale for what I'd expect to pay for a 500w unit especially considering respectable PSU's from manufacturers such as Seasonic, Silverstone and Cooler Master can be had for £65+.

The Good
- Excellent ripple results.
- Stable voltages, even under heavy load.
- Around 84-85% efficiency at most load levels.

The Mediocre
- Cable sleeving falls short of the cable length.
- Some dodgy voltage and ripple results in certain crossload situations.

The Bad
- 5 modular connectors on PSU, yet only 4 modular cables provided.
- Price quite high for a 500w unit.

Recommended Award

Thanks to Enermax for providing the Liberty EC for review. Discuss this review in our forums.
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Most Recent Comments

18-03-2009, 18:42:28

"Enermax have brought back an old favourite, only this time with increased efficiency and performance. Join us as we check out the Liberty EC 500w."


Enermax Liberty EC 500w ATX PSUQuote

18-03-2009, 18:49:23

Nice review mate. 12v rail looks especially good.Quote

18-03-2009, 18:50:04

I don't necessarily see anything wrong with the packaging and appearance.Quote

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