Enermax Liberty 620w Modular ATX PSU Page: 1
Introduced almost 2 years ago, the modular power supply design was a great hit among case modders and those who took pride in keeping their PC cases tidy. Since then the modular design has had time to mature, and higher wattage units have been released into the market.
Today I'll be taking a look at the Liberty 620w modular unit from Enermax. This power supply is actually one of the highest rated modular units available on the market at the moment, and being an avid case modder myself I am highly interested in how this unit performs.
"Enermax Technology Corporation was founded in1990 by a group of young professional, enthusiastic, and high-tech oriented people in Taiwan . The Enermax founders left high-profile positions from prestigious computer firms, bringing over 10 years of professional experiences to our own firm.
All materials and components are tested at each stage of production. We also conduct random checks on products before and after packaging, and product inspection before delivery. Our QC and testing equipments are mostly imported from Japan."
Everybody has heard of Enermax, so it's no surprise that they have decided to keep the packaging on the Liberty series nice and plain and just let their name do to the talking.
I have to admit really liking the silver and white colour scheme of the packing which, in my opinion looks fresh and professional.
Enermax Liberty 620w Modular ATX PSU Page: 2
The following information has been taken directly from Enermax's Website:
"Enermax® Liberty series power supply is for those who still live in a cave PCI-Express video card and CPU reaching near 4G require a new standard in power supply design. It is a modular power supply and come with a cable management sytem."
- Full compliance with the highest standard to desktop power requirements. Split 12V rails provide most stable current to CPU, GPU , MB and drives.
- Full support of Dual Core systems (incl. Pentium D EE and Athlon 64 X2) & Dual CPU systems.
- Convertible design to power up ATX/BTX systems and support dual CPU entry-level server/workstation.
- PF value up to 0.99 to provide stable and clean power under 100-240VAC by auto switching.
- High efficiency of about 80% under wide load range (30-100%) minimizes your electricity bill.
- Special design 12cm fan combines silence and cooling by intelligent speed control.
- Protected by OCP, OVP, UVP, OLP, SCP, OTP for maximum safety. Full rated power under 0-40 o C/32-104 o F ambient temp.
- Smarter cable choice and better cable routing for a neat and tidy case.
- Unique 4-pin Molex + SATA connectors in pairs give you free choice on using either PATA or SATA devices.
- Support of Dual PCI-E graphics cards, SLI or CrossFire.
- Toughest EMI shielding protects your system and near-by appliances.
Enermax Liberty 620w Modular ATX PSU Page: 3
Sprayed in a jet black gloss complete with gold metallic flakes, the Enermax Liberty doesn't look like your average power supply. To get the best effect from the Liberty's paint job you definitely need to have it near bright lights, as in lower light conditions the metallic flakes are not very visible. The overall finish of the Liberty is very good, but not on par with the paintwork you'd see on a car. As you can see in the pictures below, it does have an 'orange-peel' effect to it.
As with just about all power supplies that make use of a 120mm fan, the Liberty has a honeycomb mesh front which allows for the hot air passed over the components by the fan to exit out the back of your case. We can also see by the lack of a voltage selection switch that the Liberty PSU is able to auto detect the input voltage and switch accordingly.
The 120mm fan mounted in the top of the unit is protected by a gold fan grill which sports the Enermax logo. Personally I like gold fan grills and believe it to go well with the rest of the power supply, but I can imagine readers having a big divide on this opinion.
Enermax Liberty 620w Modular ATX PSU Page: 4
All cables on the Enermax Liberty are sleeved in gold and black mesh which is a welcome break from the usual plain black mesh, and also fits in with the colour scheme of the PSU. The only thing that I found slightly disappointing was that Enermax did not choose to sleeve every cable right up to the connector, which left a lot of bare cables on show.
In a change from the normal cable layout, Enermax have placed both Molex and SATA connectors on the same cable. Personally I'm not keen on this idea as it means you are more than likely to be left with lots of unused connectors on each cable. I'd be interested to find out why Enermax decided to go with this system, which they call 'Eternity'.
Enermax Liberty 620w Modular ATX PSU Page: 5
As with all power supplies that pass through Overclock3D, I'll be taking a look inside the Liberty. By doing this I should be able to get a good idea of the overall build quality of the unit and how it is likely to perform in our tests.
Keeping in theme with the rest of the unit, Enermax have also colour coded the aluminium heatsinks gold. The heatsinks are actually quite small, but the large number of fins should be fairly effective in drawing the heat away from the components.
The internal components are of a reasonable size, but do not occupy the entire unit. This can be the sign of a manufacturer using insufficient quality components, but as I've seen on some other makes of power supply, this is not always the case. As the saying goes "the proof of the pudding is in the tasting", so we'll see how the Liberty performs over the next page.
I'm always on the lookout for adjustable pots in PSU's that pass through OC3D, as these can come in very handy on increasing the voltages if they droop under heavy load. Unfortunately I was unable to find any on the Liberty, which is a great shame - let's hope they are not needed.
A quick search of the internet reveals that Enermax have utilised a 120mm fan manufactured by Globefan. This fan is capable of pushing 81cfm at 39dBA whilst running at 2400RPM. Luckily, Enermax have implemented a fan speed controller into the Liberty series, which means that the fan will run much slower (and quieter) under low/medium loads.
Enermax Liberty 620w Modular ATX PSU Page: 6
In order for the results from all current and future PSU reviews to remain fair and comparable, Overclock3D uses a custom built Power Supply load stress tester.
The tester will be placing the following loads on each of the Liberty 620w rails:
+3.3v - 20a Load
+5.0v - 20a Load
+12v1 - 20a Load
+12v2 - 10a Load
The results are collected from a Mastech MAS-345 Multimeter which logs its readings via RS232 to a PC.
Efficiency tests are performed by measuring the wattage consumed by the power supply at the mains against the power (in watts) consumed by the OC3D power supply stress tester.
The results may not be as accurate as those produced by professional testing equipment, but will certainly come in handy when comparing several power supplies against each other.
Therefore the efficiency of this power supply can be found by a simple equation: (526 / 638) * 100 that works out to be an efficiency rating of 82.4%, which is very close to the 80% efficiency rating given by Enermax.
The Liberty 620w was placed under a load of 526 watts. This counts for a total of 85% of the power supplies rated output. At this load, the power supply required 638 watts from the mains to produce the 526 watts required by our custom made power supply tester.
Cooling the Liberty 620w is a 120mm fan manufactured by Globefan. This fan is rated at 39dBA when running at full speed which may give the impression that this unit is going to be quite noisy.
However, under idle conditions the fan is whisper quiet, and only audible if you have the unit close to your ear. With the unit installed inside a standard pc case, I was unable to hear the unit at all.
Under heavy load conditions the Liberty steps up the fan speed significantly. This does cause an increase in noise, but not to the point where it becomes an irritation. I'd estimate the noise output under load to be around 25dBA.
Enermax Liberty 620w Modular ATX PSU Page: 7
With more and more modular power supplies entering the market, it is hard to come up with something that separates itself from the pack. Enermax have certainly managed this with the Liberty, by not only making one of the highest power modular units on the market but by also making it stand out with looks as well.
In terms of performance, the Liberty fairs quite well with rails staying well within ATX specification even when placed under extremely high load. The unit also manages a good efficiency rating of 82% which should help save on some of those electricity bills.
The Enermax Liberty 620w can be purchased from SpecialTech for £99.85, which places it in direct competition with other modular 500-600w units available on the market.
+ Metallic paintwork
+ Rails suitable for SLI/Crossfire
+ Lots of connectors
+ Reasonable noise levels under full load
- Gold may not appeal to everyone
- Eternity cable system may not suit everyone
- No adjustable pots
Thanks to Enermax for providing this sample for review.
Discuss this review in our forums.