Enermax Noisetaker II (Rev. 2.2): A New Rev of an Old Fave

Power
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May 31, 2006 by Devon Cooke

Product
Enermax Noisetaker II EG701AX-VE(W) (Revision 2.2)
600W ATX12V 2.2 Dual Fan Power Supply
Manufacturer
Enermax Technology Corporation
Market Price
~US$150

Enermax was one of the first companies to sell retail package power supplies and remains a highly visible brand name. SPCR reviewed the original Noisetaker two years ago, when low noise was starting to become a popular marketable feature in power supplies. At the time, it received a glowing review for being quieter and more efficient than most of the competition.

What a difference two years makes. Were it reviewed today, the original Noisetaker would not distinguish itself from the crowd. Perhaps that is why Enermax released the Noisetaker II, which we reviewed just over a year ago. That update brought the Noisetaker into compliance with Intel's new ATX12V 2.0 specification, corrected a problem with stiff cabling, and introduced a ferrite ring to reduce EMI.

The latest revision is more of a response to changes in marketing demand than any technical requirement, althought it is now compliant with Intel's ATX12V version 2.2 spec. There are more SATA connectors, an additional PCIe plug for SLI or CrossFire setups, and an EPS12V plug for multiple processors. Minor changes to the exterior casing and fan controller have also been made.


The retail box has gotten smaller. We like that.


A multi-lingual manual, the PSU itself, screws, a power cable, an Enermax sticker and... a keychain?

FEATURE HIGHLIGHTS

Feature Highlights of the Enermax NoiseTaker II (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
Split rails have been required since ATX12V 2.0, and were a feature of the Noisetaker even before then.
Full support of Dual Core systems (incl. Pentium D EE and Athlon 64 X2) & Dual CPU systems. Yep. 600W goes a long way.
Convertible design to power up ATX/BTX systems and support dual CPU entry-level server/workstation.
Versatility is an asset, and most of the various specifications are similar enough that a single power supply works with all of them.
After PC shuts down, cooling fans keep running for at least 30 sec. to effectively cool down parts and hardware inside PSU and PC case.
Supposedly good for reliability. We're not sure.
High efficiency of about 80% under wide load range (30-100%) minimizes your electricity bill.
A feature of the original Noisetaker.
PF value up to 0.99 to provide stable and clean power under 100-240VAC by auto switching.(AX models only) Active power factor correction.
Protected by OCP, OVP, UVP, OLP, SCP, OTP for maximum safety. Full rated power under 0-40°C/32-104°F ambient temp.
Over Current Protection, Over Voltage Protection. Under Voltage Protection, Over Load Protection, Short Circuit Protection, Over Temperature Protection.
The best cooling method for PC system, and is strongly suggested by AMD. We disagree. Using the power supply to cool the system often results in a louder power supply.
Manual fan speed control to keep the balance between cooling effect and acoustic noise. Automatic fan speed adjustments to prevent system overheat. Mostly a gimmick, but could be useful for controlling system cooling.

SPECIFICATIONS

OUTPUT SPECIFICATIONS: Enermax NoiseTaker II
AC Input
100-240VAC 50-60Hz
AC Input Current
9.5~4A
DC Output
+3.3V
+5V
+12V1
+12V2
-12V
+5VSB
Maximum Output Current
34A
34A
22A
22A
0.6A
3.0A

Maximum Combined

180W
420W (35A)
7.2W
15.0W
577.8W
22.2W
600W

The individual line ratings are all quite beefy. Both of the +12V rails have been bumped up by 4A since the last revision, as has the +5V standby line. However, the reality is that real limits on output power are most often seen in the combined power ratings, which have not changed.

The increased capacity on each of the +12V rails is a little bit odd. The sole reason for having multiple lines is to prevent more than 240 VA (12V × 20A) from being delivered from a single rail, as per the requirements of UL and CSA. So why rate the +12V rails at 22A, which may allow more than 240 VA to flow anyway? Why not have a single rail rated at 35A?

The answer is most likely political. Enermax can get away with specifying two +12V rails at 22A each because it is only a minor deviation from the specification. On the other hand, eliminating the second +12V rail would be a flagrant violation of the ATX12V specification, and would be frowned on by Intel and anyone else who reads the ATX12V specifications.



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