Enermax Liberty EL500AWT & EL620AWT power supplies

Power
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Nov 2, 2005 by Devon Cooke

Product
Enermax Liberty EL500AWT / EL620AWT
500 / 620W ATX12V 2.2 Power Supplies
Manufacturer
Enermax Technology Corporation
Distributors (USA)

Maxpoint
Coolergiant Computers Inc.

Market Price

US$125 (500) / US$190 (620)

No More Limits! So says the marketing material for the Enermax Liberty, as though computer users everywhere are held in bondage by their power supply. The Liberty is the company's first power supply with a 120mm fan, and their first offering with modular cables.

Modular cables are still somewhat of a novelty. We have seen a number of modular cable power supplies in the past, but none has seemed so complete as the Liberty. This isn't just a basic model whose cables happen to come off; there are lots of small touches — even a storage case for spare cables — that suggest serious thought about its design.

There are three models in the Liberty lineup, which differ mainly in output capacity and the number of cables included. We received samples from both of the distributors in the U.S. The 500W model came from Maxpoint, and the 620W model came from Coolergiant. There is also a third model rated for 400W.

Just in case any readers are unaware of the brand, here's a quick recap from an earlier Enermax review:

Enermax is one of the very first names that comes to mind when you think of computer power supplies. They were the first to merchandise the power supply as more than a mysterious gray box that hums in the back of the PC. With their signature metallic paint, shiny wire grills, and classy sleeving for cables, they have long been among the most visible of PSU brands.

Of course, with the surge in retail power supply mechandizing over the past couple of years, none of the above mentioned traits are outstanding any more. As you will see, with the Liberty, they've upped the ante without resorting to non-functional bling. The Liberty is definitely targeted at the high end, with a focus on functionality. In addition to screws, cables and the power supply, our samples came with a soft carrying case for spare cables, a thick, multilingual manual, a pair of Enermax branded stickers, and an Enermax branded keychain.


A huge retail box...


...holds lots of goodies. Highlights include a cable pouch and a keychain.

FEATURE HIGHLIGHTS

Feature Highlights of the Enermax Liberty (from Enermax' web site)

FEATURE & BRIEF COMMENT

Full compliance with the highest standard to desktop power requirements. Split 12V rails provide most stable current to CPU, GPU, MB and drives.

What split rails actually mean.
Full support of Dual Core systems (incl. Pentium D EE and Athlon 64 X2) & Dual CPU systems. I would hope so... there's no electrical difference between a single core and a dual core CPU.

Convertible design to power up ATX/BTX systems and support dual CPU entry-level server/workstation.

20 and 24-pin main connectors are supported, as are 4 and 8-pin AUX connectors.

PF value up to 0.99 to provide stable and clean power under 100-240VAC by auto switching.

A power factor this high can only be achieved with active power factor correction.

High efficiency of about 80% under wide load range (30-100%) minimizes your electricity bill.

80% is a good target.
Special design 12cm fan combines silence and cooling by intelligent speed control. Enermax' first 120mm fan power supply.

Protected by OCP, OVP, UVP, OLP, SCP, OTP for maximum safety. Full rated power under 0-40°C/32-104°F ambient temp.

OCP: Over Current Protection
OVP: Over Voltage Protection
UVP: Under Voltage Protection
OLP: Over Load Protection
SCP: Short Circuit Protection
OTP: Over Temperature Protection
The 40°C spec is a sign of realistic power ratings.

Smarter cable choice and better cable routing for a neat and tidy case. No More Limits, remember?
Unique 4-pin Molex + SATA connectors in pairs give you free choice on using either PATA or SATA devices. Cables sets reflect the way they are actually used.
Support of Dual PCI-E graphics cards, SLI or CrossFire. Two PCIe connectors, and enough power for both.
Toughest EMI shielding protects your system and near-by appliances. EMI shielding is required to pass international certification tests.

OUTPUT SPECIFICATIONS

Enermax Liberty EL500AWT (500W)

AC Input

100-240VAC / 50-60Hz / 7.5 - 3.5A
Maximum AC Current
10A @ 120V / 6A @ 240V

DC Output

+3.3V

+5V

+12V1

+12V2

-12V

+5VSB

Maximum Output Current

28A

30A

22A

22A

0.6A

3.0A

Maximum Combined

160W

384W (32A)

7.2W

15W

477.8W
22.2W

500W

Enermax Liberty EL620AWT (620W)

AC Input

100-240VAC / 50-60Hz / 9.5 - 4.0A
Maximum AC Current
10A @ 120V / 6A @ 240V

DC Output

+3.3V

+5V

+12V1

+12V2

-12V

+5VSB

Maximum Output Current

28A

32A

22A

22A

0.6A

3.0A

Maximum Combined

170W

432W (36A)

7.2W

15W

597.8W
22.2W

620W

The output ratings for our two samples are quite similar. On the individual rails, only the +5V rail has changed, by a paltry 10W. So where does the extra power in the 620W model come from? Some of it comes from a 48W increase in the combined rating for the +12V rails, but most of it is in the combined 3.3V + 5V + 12V1 + 12V2 rating. This means that the extra power is distributed fairly evenly through the main voltage lines.

One nice thing about both models is the strong +5VSB (standby) rail. Not enough current capacity here can be an issue for those who like to use lots of peripherals; this rails supplies power even when the computer is "off" and is often used to power external USB devices.

One oddity is the 22A rating of the +12V rails: Intel's main justification (in ATX12V v.2xx PS Design Guide) for two 12V rails is to keep the current on any individual rail below 240VA. It seems odd that the 12V lines should be rated above 20A (20A x 12V = 240VA). In real usage, neither rail is ever likely to approach its rated maximum, so the point is mostly moot, but it does make the "separate" rails kind of pointless.



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