Enermax ECO80+ 350w ATX PSU

Simulated Load Testing

Simulated Load Testing

To provide our readers with the most accurate results, Overclock3D uses a professional grade SunMoon SM-268+ ATE load tester capable of placing a sustained load of 1690w across a total of six rails (including +5vsb and -12v) on the PSU. Unlike our previous resistor-based load tester, the SM-268+ gives us the ability to adjust amperage loads in increments as small as 0.01A while also measuring voltages and wattage readings on-screen.

During today's tests, we will be placing the Enermax ECO80+ 350w under 25%, 50%, 75% and 100% load levels at both room temperature and inside a hot box regulated to a temperature of around 50°C. Additional 'Cross Load'  and a 'Max Load' tests will also be performed under these conditions to simulate how the PSU reacts to heavily uneven loads as well as running above its specified output.
 
Enermax ECO80+ 350w Results @ Room Temperature
   +3.3v  +5.0v  +12v*  +5vSB  -12v  AC Watts /
 DC Watts
 Efficiency  Intake /
 Exhaust
Δ Temp
Test 1
(Low)
2.50A 2.50A 5.00A  0.75A  0.15A  103w /
87w
 84.46%  24.4°C /
  29.2°C
4.8°C
 3.34v 5.03v 12.24v 5.11v  -11.87v
Test 2
(Med)
 5.00A  5.00A  10.00A 1.5A  0.30A  205w /
175w
 85.36%  24.9°C /
33.6°C
8.7°C
3.32v
5.00v
12.22v 5.08v  -11.90v
Test 3
(High)
7.50A 7.50A 15.00A  2.25A  0.45A  307w /
262w
 85.34%  25.6C /
40.4°C
14.8°C
3.30v 4.98v 12.22v 5.04v -11.92v
Test 4
(Full)
 10.00A  10.00A  20.00A  3.00A  0.60A  415w /
349w
 84.09%  25.4°C /
43.1°C
 17.7°C
3.27v 4.96v 12.20v 4.99v -11.98v
Test 5
(x-load)
11.00A 11.00A 1.00A 0.00A 0.00A  129w /
102w
79.06% 24.8°C /
36.7°C
11.9 °C
3.27v 4.87v 12.61v 5.13v -12.30v
Test 6
(x-load)
 1.00A  1.00A  27.00A  0.00A  0.00A  379w /
326w
86.01%  24.6°C /
44.6°C
 20.0°C
 3.35v 5.14v 11.76v 5.14v -12.36v
Test 7
(MAX)
 13.61A  10.77A  26.60A  4.50A  0.60A  545w /
449w
82.38%  24.7°C /
45.6°C
 20.9°C
3.24v 4.96v 12.12v 4.87v -12.05v
* It should also be noted that the all +12v rails on the ECO80+ will be combined during the testing.
 
Starting off with the results from the standard load tests (1-4), one word that springs to mind is WOW. Neither the +3.3v, +5v or +12v rails budged by any considerable amount with the maximum difference between low and full loads being 0.07v. The cross load results in tests 5 and 6 flagged up some potential issues with the +12v rails as they were on the verge of rising outside ATX spec (+/-5%) in test 5 and also fell quite low in test 6. But realistically these kind of skewed loads are highly unlikely to occur in a real PC system.
 
The ECO80+ was also the first PSU to undergo our new MAX Load test in which each of the rails was pushed as high as it could go before the safety features of the unit kicked in and switched it off. Once again the ECO80+ performed admirably managing to deliver 449w - almost 100w more than its rated output, and still with extremely good output voltages!
 
Enermax ECO80+ 350w Results @ 50°C
   +3.3v  +5.0v  +12v  +5vSB  -12v  AC Watts /
 DC Watts
 Efficiency  Intake /
 Exhaust
Δ Temp
Test 1
(Low)
2.50A 2.50A 5.00A  0.75A  0.15A  103w /
87w
 84.46%  51.2°C /
  51.2°C
0.0°C
 3.34v 5.04v 12.22v 5.11v  -11.89v
Test 2
(Med)
 5.00A  5.00A  10.00A 1.5A  0.30A  205w /
175w
 85.36%  50.7°C /
54.7°C
4.0°C
3.32v 5.01v 12.22v 5.07v  -11.92v
Test 3
(High)
7.50A 7.50A 15.00A  2.25A  0.45A  307w /
262w
 85.34%  50.6C /
57.8°C
 7.1°C
3.30v 4.99v 12.22v 5.03v -11.97v
Test 4
(Full)
 10.00A  10.00A  20.00A  3.00A  0.60A  415w /
349w
 84.09%  50.7°C /
62.4°C
 11.7°C
3.27v 4.97v 12.20v 4.98v -12.00v
Test 5
(x-load)
11.00A 11.00A 1.00A 0.00A 0.00A  129w /
102w
79.06% 50.5°C /
51.5°C
1.0 °C
3.27v 4.88v 12.64v 5.13v -12.32v
Test 6
(x-load)
 1.00A  1.00A  27.00A  0.00A  0.00A  384w /
326w
84.89%  51.0°C /
55.5°C
 4.5°C
 3.35v 5.14v 11.76v 5.13v -12.38v
Test 7
(MAX)
 13.61A  10.77A  26.60A  4.50A  0.60A  548w /
448w
81.75%  50.7°C /
67.3°C
 16.6°C
3.23v 4.96v 12.10v 4.85v -12.12v

With the temperature cranked up to 50°C and a re-run of all the previous tests, the ECO80+ showed no additional signs of strain, producing near identical results to those conducted at room temperature. This is very impressive considering that Enermax have only rated the ECO80+ at 40°C.
 
Additionally one other area that is certainly worthy of mention before we move on to the scope results is efficiency. In tests 1-4 (the ones closest to real-world situations), the ECO80+ managed between 84-85% efficiency showing that it's certainly no gas guzzler! Only when the unit was really pushed to its limits or handed a nasty crossload did the efficiency dip closer to the 80% mark.
 
Enermax ECO80+ 350w Scope Results @ 50c
   +3.3v  +5.0v  +12v
Test 1
(Low)
T1_3.3V T1_5V T1_12V
Test 2
(Med)
t2_3.3v t2_5v t2_12v
Test 3
(High)
t3_3.3v t3_5v t3_12v
Test 4
(Full)
t4_3v t4_5v t4_12v
Test 5
(x-load)
t5_3.3v t5_5v t5_12v
Test 6
(x-load)
t6_3.3v t6_5v t6_12v
Test 7
(MAX)
T7_3.3 T7_5 T7_12

For the last part of the testing we analysed the ripple on the +3.3, +5 and +12v rails using a Rigol 25Mhz 400MSa/s oscilloscope. All readings were taken while the PSU was installed inside our 50°C hot box to provide us with worst case scenario results.
 
Once again the ECO80+ proved to be truly amazing with the +3.3v and +5v rails staying below 22mV in tests 1-4 and only hitting 28mV on the +5v rail in test 5. The +12v rails also managed to keep ripple to a minimum with test 1 starting at 22mV, increasing to 42mV by test 4; and test 7 giving the highest reading of 52mV when the unit was running well above its rated output at 448W.
 
To put these results into context, ATX specification states that the +3.3v and +5.0v rails must stay below 50mV ripple, while the +12v rails must remain within 120mV.The ECO80+ certainly managed this with ease, so let's move on to the conclusion...
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Most Recent Comments

19-06-2009, 07:49:40

JN
"Enermax show us that you don't need to buy a high-output PSU to get all the fancy trimmings. As today we review their latest 350w model, the ECO80+."

http://www.overclock3d.net/gfx/artic...203633840s.jpg

Enermax ECO80+ 350w ATX PSU

19-06-2009, 07:55:13

Rastalovich
Great stuff, great unit, nice1.

45.99 rrp, where I'd expect online firms to probably cut that a little.

19-06-2009, 07:57:39

JN
Quote:
Originally Posted by name='Rastalovich'
Great stuff, great unit, nice1.

45.99 rrp, where I'd expect online firms to probably cut that a little.
Yeah with a bit of competition between scan/ocuk I think it could probably be had for closer to 40. Considering its fitted with a ~10 fan too, its worth every penny imo.

19-06-2009, 09:06:54

tinytomlogan
Aye looks to be a great little unit, well worth the money for a basic system.

19-06-2009, 11:09:30

maxw
On the connectors bit, the table header is "BFG EX-1200 Connectors"

Nice review, I might get one to put in a friends build

19-06-2009, 12:49:00

FarFarAway
Looks like an absolute cracking unit at a superb price. People who still buy ebuyer own PSU's instead of this thing need to be shot

Great review Jim

19-06-2009, 16:00:16

JN
Thanks all..

Quote:
Originally Posted by name='maxw'
On the connectors bit, the table header is "BFG EX-1200 Connectors"
..and wh000ps well spotted.

19-06-2009, 17:48:34

monkey7
Great little unit for smaller builds. Rock stable, 450W max, not bad at all
Reply
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