Reviews - Enhance ENP-5140GH 400W
Sample Provided by: Enhance USA (By jonny on Sat, Aug-05-2006)

Page 1 -

I received the Enhance power supply that I'm reviewing today in a very unassuming package: A plastic bag. The power supply is sold as an "OEM" unit, with no retail box, manual, etc.

Fortunately, the website is fairly informative, so one knows what they're getting into before ordering an ENP-5140H power supply. Hopefully this review helps as well. :-)

The ENP-5140GH is only 5.5" deep, so it will fit in the smallest ATX cases. It's also full range active PFC, so it works with virtually any AC input (within 100 to 240V)

The label boasts a < 25dBA noise level and "80 plus" efficiency. With 80% efficiency, the power supply shouldn't generate much heat, so a 120MM fan doesn't have to spin very fast and move much air, therefore it can be very quiet.

Type of connector: Enhance ENP-5140GH
ATX connector 20+4
2 x 2 12V connectors 1
2 x 3 PCIe 1
8-pin Xeon/EPS connector 1*
6-pin Xeon/AUX connector 0
5.25" Drive connectors


3.5" Drive connectors 1
SATA Drive power connectors 4
Fan only connectors (thermostatically controlled 12V only) 0
* = Two four pin connectors combine to create the 8-pin EPS+12V connector

Above is a shot of the label on the side of the ENP-5140GH. Note the lack of a 12V combined rating. An email to Enhance resolved that the combined 12V rating was 28A.

Enhance ENP-5140GH +3.3V +5V +12V1 +12V2 -12V +5VSB
20A 14A 16A 18A 0.3A 3.0A
Max Combined Watts 130W 336W 9.6W 15W

In confirming the combined 12V rails were in fact limited to 28A, I put a number of experimental loads on the unit. I found that each 12V rail's limiters have in fact been set to exactly 16A and 18A and that any combination that was greater than 28A would trip the power supply.

And now for the load tests.

For testing power supplies, I use a SunMoon power supply tester. Essentially, it's a machine made to put 10 different static load on up to 10 different rails at a time. More information on the testing methodology can be found here.

Results from Enhance ENP-5140GH COLD load tests
+3.3V +5V +12V1 +12V2 Watts Efficiency P.F. Intake Exhaust
Simulated system load tests
3A 5A 2A 2A 98.8W 80% .98 26°C 26°C
3.35V 5.01V 12.12V 12.13V
6A 9A 5A 5A 201.3W 83% .99 26°C 26°C
3.34V 4.99V 12.10V 12.10V
9A 12A 8A 8A 297.8W 83% .99 26°C 26°C
3.32V 4.98V 12.06V 12.07V
12A 15A 11A 11A 394.1W 82% .99 26°C 27°C
3.31V 4.96V 12.02V 12.04V
6A 7A 14A 14A 407W 82% .99 26°C 27°C
3.33V 4.99V 12.02V 12.04V

With each test being run for no less than 15 minutes (typically longer as a certain 3 year old often demands my attention away from the load tester,) we found that the Enhance ENP-5140GH can in fact put out 400W. But to do so, we had to lower the 3.3V and 5V rails so we could maximize the 12V rails (the rails that would have the most demand on them in a real PC.)

We find that the voltage dropped only .1V over the full gamut of tests and efficiency was at 80% and better. This improved efficiency also resulted in lower exhaust temps. Active PFC was in fact working as we were seeing PF of .99.

Now let's see if any of this changes in the hot box.

The "hot box" is nothing more than the power supply running in a sealed up Ultra Wizard case. Only the side panel CPU vent has been replaced with an intake hose and an 80MM intake fan. On the other end of the house is the exhaust of the load tester. You can read more about it here.

Results from Enhance ENP-5140GH HOT load tests
+3.3V +5V +12V1 +12V2 Watts Efficiency P.F. Intake Exhaust
Simulated system load tests
3A 5A 2A 2A 98.8W 80% .98 31°C 31°C
3.35V 5.01V 12.12V 12.13V
6A 9A 5A 5A 201.3W 83% .99 31°C 31°C
3.34V 4.99V 12.10V 12.10V
9A 12A 8A 8A 297.8W 83% .99 31°C 32°C
3.32V 4.98V 12.06V 12.07V
12A 15A 11A 11A 394.1W 82% .99 32°C 34°C
3.31V 4.96V 12.02V 12.04V
6A 7A 14A 14A 407W 82% .99 33°C 37°C
3.33V 4.98V 12.02V 12.04V

Much to my amazement, nothing really changed. The 5V rail dropped .01V from the cold test during test 5, ambient temps increased by 7 degrees at the most and the delta between the intake and exhaust measurements was only 4 degrees!

I also like how this confirms the accuracy of the ATE. See, the above cold and hot tests were actually performed a week apart. The Enhance power supply was completely removed from the ATE after the cold tests were performed, while three other power supplies were tested on it during the week. Then the Enhance was reconnected to the ATE nearly a week later. Yet all of the reading still seem to be spot on from the first time it was hooked up.

For those curious about the cross load test, I think by looking at the difference between test four and five might tell you how that went. In order to get to 400W by increasing the 12V rails to their maximum, I had to cut the load on the 3.3V and 5V rails in half. Despite this, the 12V rail did not change at all. When I dropped the 3.3V and 5V rails all of the way down to 3A and 4A respectively, the 12V rails still hung in at 12.02 and 12.04V.

Now let's see how all of this looked on the oscilloscope..

+3.3V +5V +12V1 +12V2
Test 1
Test 2
Test 3
Test 4
Test 5

I think we can say "wow" to that. The 3.3V and 5V barely wavered, and even under the most stress the 12V rail only exhibited a 30mV ripple. That's fantastic!

Ripple is measured at the load by an USB Instruments Stingray DS1M12 . Instead of using the Stingray with probes to measure ripple, I actually use the Stingray as a medium between the data being spit out by the SunMoon load tester and my laptop. Each change in voltage is collected and reported every .2ms. The time divide on the graphs is 2ms (every square being 2ms) The voltage scale on the graph is .05V, or 50mV. As we can see from the results of the ENP-5140GH, even under the greatest load the voltage doesn't move enough to fill even half of a box.

During the autopsy, we see a very clean PCB. Despite the excellent efficiency, we can see that Enhance takes good measure to ensure that all components are effectively cooled. The heatsinks come up off the PCB and are then split into tiny fingers. Fingers with more surface area that your typical machined aluminum heatsink. The 120MM fan can easily push air down onto the sinks as the sinks themselves do not create an obstruction to airflow.

In the above and below photos, we can see that Enhance uses all Teapo capacitors. Although Teapo has received a bad reputation in the motherboard world, their role in power supplies have always been one of the best. Teapos are frequently used in power supplies from PC Power and Cooling and Etasis.

Cooling duties are performed by an ADDA AD1212MB-A71 120MM ball bearing fan. No reason to swap this puppy out. It moves air and it's quiet and it will probably out live the rest of your computer.

Now that we've completed all of the formalities, let's score our power supply...

Performance (weight of 40%) gets a 10. The efficiency is always 80% and better, it has active PFC and it does what Enhance says it should do. Ripple was less than 50mV even under full load and the fan was nearly silent. Now for apples to apples comparison, you need to remember that this is "only" a 400W power supply. But if you had ANY machine that didn't need a pair of PCI-e connectors, I would feel very confident in saying this power supply is going to be more than adequate.

Aesthetics (weight of 10%) is 6. This isn't the "pretty up the inside of the case" type of power supply we usually see on The cables aren't even sleeved. Good thing aesthetic's score only has a 10% weight!

Value (weight of 30%) score is a 10. This unit is only $56 from eWiz. At $56 you don't typically see a PSU with APFC and better than 80% efficiency, never mind one that is as stable as this one.

For functionality (weight of 20%,) I'm giving this power supply a 7.5. It's not modular and the cables aren't even sleeved, but it has all of the necessary connector for a non-SLI/Crossfire build, the cables are plenty long enough and it has a compact 5.5" depth.

Overall, the Enhance ENP-5140GH gets a score a "9" Simply put, I really liked this power supply and wouldn't hesitate to recommend it to anyone that wasn't trying to run a power hungry system with a pair of high end video cards. That said, with 28A on the combined 12V rails, I would say this power supply could probably outperform a number of the so-called "500W" power supplies out there.

Performance 10
Aesthetics 6
Value 10
Functionality 7.5
Total Score 9



Having a < $100 budget is really tough when shopping for a power supply. You RARELY get enough power, almost never get active PFC, don't see 80% and up efficiency.. Enhance is breaking that cycle with this unit. It offers so much in a small package, it's a hard one to pass up.

The Good....

  • 80%+ efficiency
  • Active PFC
  • Solid rails with only a .1V drop over a 12A load on the 12V rail and less than 50mV of ripple!
  • Very low price

The Bad....

  • Nothing bad to say!

The Mediocre....

  • Not pretty
  • No cables are sleeved
  • Only one PCI-e connector


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