Load Testing
Test 1 (74.13W Load)
| Rail |
Load |
Voltage |
Ripple |
| 12V |
2.3A |
12.18V |
11.0mV |
| 5V |
5.1A |
5.1V |
16.6mV |
| 3.3V |
4.91A |
3.34V |
16.0mV |
| -12V |
0.1A |
-11.53V |
6.2mV |
| 5Vsb |
0.51A |
5.09V |
10.2mV |
| AC Power |
92.8W |
| Efficiency |
79.88% |
| Power Factor |
0.8 |
.
Test 2 (122.95W Load)
| Rail |
Load |
Voltage |
Ripple |
| 12V |
4.7A |
12.17V |
10.2mV |
| 5V |
5.09A |
5.09V |
15.0mV |
| 3.3V |
10.09A |
3.33V |
14.6mV |
| -12V |
0.1A |
-11.57V |
6.2mV |
| 5Vsb |
1.01A |
5.06V |
9.4mV |
| AC Power |
142.9W |
| Efficiency |
86.04% |
| Power Factor |
0.85 |
.
Test 3 (152.09W Load)
| Rail |
Load |
Voltage |
Ripple |
| 12V |
7.1A |
12.16V |
10.8mV |
| 5V |
5.09A |
5.09V |
15.4mV |
| 3.3V |
10.09A |
3.33V |
15.2mV |
| -12V |
0.1A |
-11.58V |
6.8mV |
| 5Vsb |
1.01A |
5.06V |
9.6mV |
| AC Power |
173.4W |
| Efficiency |
87.71% |
| Power Factor |
0.87 |
.
Test 4 (206.16W Load)
| Rail |
Load |
Voltage |
Ripple |
| 12V |
9.5A |
9.5A |
12.2mV |
| 5V |
10.14A |
5.07V |
17.8mV |
| 3.3V |
10.03A |
3.31V |
15.6mV |
| -12V |
0.1A |
-11.61V |
7.2mV |
| 5Vsb |
1.01A |
5.05V |
11.4mV |
| AC Power |
230.4W |
| Efficiency |
89.48% |
| Power Factor |
0.89 |
.
Test 5 (262.94W Load)
| Rail |
Load |
Voltage |
Ripple |
| 12V |
14.2A |
12.12V |
14.0mV |
| 5V |
10.14A |
5.07V |
17.6mV |
| 3.3V |
10.03A |
3.31V |
16.4mV |
| -12V |
0.1A |
11.64V |
7.2mV |
| 5Vsb |
1.01A |
5.05V |
12.0mV |
| AC Power |
290.9W |
| Efficiency |
90.39% |
| Power Factor |
0.89 |
.
Test 6 (318.31W Load)
| Rail |
Load |
Voltage |
Ripple |
| 12V |
18.8A |
12.11V |
42.0mV |
| 5V |
10.08A |
5.04V |
19.6mV |
| 3.3V |
9.97A |
3.29V |
17.8mV |
| -12V |
0.1A |
-12.14V |
403.2mV |
| 5Vsb |
1.01A |
5.03V |
14.4mV |
| AC Power |
352.9W |
| Efficiency |
90.20% |
| Power Factor |
0.91 |
.
Test 7 (373.44W Load)
| Rail |
Load |
Voltage |
Ripple |
| 12V |
23.5A |
12.1V |
42.6mV |
| 5V |
10.08A |
5.04V |
19.8mV |
| 3.3V |
9.85A |
3.25V |
18.4mV |
| -12V |
0.1A |
-12.08V |
>500mV |
| 5Vsb |
1.01A |
5.03V |
14.4mV |
| AC Power |
410.9W |
| Efficiency |
90.88% |
| Power Factor |
0.91 |
.
Test 8 (402.23W Load)
| Rail |
Load |
Voltage |
Ripple |
| 12V |
25.9A |
12.09V |
45.8mV |
| 5V |
10.08A |
5.04V |
20.2mV |
| 3.3V |
9.85A |
3.25V |
19.2mV |
| -12V |
0.1A |
-12.03V |
>500mV |
| 5Vsb |
1.01A |
5.04V |
15.0mV |
| AC Power |
442.0W |
| Efficiency |
91.00% |
| Power Factor |
0.91 |
.
Test 9 (460.1W Load)
| Rail |
Load |
Voltage |
Ripple |
| 12V |
30.7A |
12.08V |
20.8mV |
| 5V |
10.1A |
5.05V |
21.2mV |
| 3.3V |
9.85A |
3.25V |
20.4mV |
| -12V |
0.1A |
-11.75V |
59.4mV |
| 5Vsb |
1.01A |
5.04V |
16.4mV |
| AC Power |
500.4W |
| Efficiency |
91.95% |
| Power Factor |
0.94 |
.
Test 10 (516.88W Load)
| Rail |
Load |
Voltage |
Ripple |
| 12V |
35.4A |
12.08V |
23.4mV |
| 5V |
10.1A |
5.05V |
22.2mV |
| 3.3V |
9.85A |
3.25V |
21.8mV |
| -12V |
0.1A |
-11.77V |
11.0mV |
| 5Vsb |
1.01A |
5.04V |
17.8mV |
| AC Power |
561.4W |
| Efficiency |
92.07% |
| Power Factor |
0.94 |
.
Test 11 (573.66W Load)
| Rail |
Load |
Voltage |
Ripple |
| 12V |
40.1A |
12.08V |
26.0mV |
| 5V |
10.1A |
5.05V |
23.2mV |
| 3.3V |
9.85A |
3.25V |
23.6mV |
| -12V |
0.1A |
-11.8V |
11.6mV |
| 5Vsb |
1.01A |
5.04V |
18.8mV |
| AC Power |
623.5W |
| Efficiency |
92.01% |
| Power Factor |
0.94 |
.
Test 12 (629.24W Load)
| Rail |
Load |
Voltage |
Ripple |
| 12V |
44.7A |
12.08V |
29.4mV |
| 5V |
10.1A |
5.05V |
24.2mV |
| 3.3V |
9.85A |
3.25V |
25.6mV |
| -12V |
0.1A |
-11.84V |
12.4mV |
| 5Vsb |
1.01A |
5.04V |
20.0mV |
| AC Power |
687.0W |
| Efficiency |
91.59% |
| Power Factor |
0.93 |
.
Test 13 (691.87W Load)
| Rail |
Load |
Voltage |
Ripple |
| 12V |
49.4A |
12.08V |
32.8mV |
| 5V |
10.08A |
5.04V |
25.4mV |
| 3.3V |
9.85A |
3.25V |
27.2mV |
| -12V |
0.2A |
-11.77V |
13.8mV |
| 5Vsb |
2.02A |
5.04V |
21.6mV |
| AC Power |
758.5W |
| Efficiency |
91.22% |
| Power Factor |
0.95 |
.
Test 14 (749.87W Load)
| Rail |
Load |
Voltage |
Ripple |
| 12V |
54.2A |
12.08V |
37.2mV |
| 5V |
10.08A |
5.04V |
26.2mV |
| 3.3V |
9.85A |
3.25V |
29.0mV |
| -12V |
0.2A |
-11.8V |
15.2mV |
| 5Vsb |
2.02A |
5.04V |
23.0mV |
| AC Power |
821.8W |
| Efficiency |
91.25% |
| Power Factor |
0.94 |
.
Overload Test (950.36W Load)
| Rail |
Load |
Voltage |
Ripple |
| 12V |
70.4A |
12.05V |
70.2mV |
| 5V |
10.08A |
5.04V |
32.0mV |
| 3.3V |
9.85A |
3.24V |
36.0mV |
| -12V |
0.39A |
-11.76V |
29.2mV |
| 5Vsb |
2.98A |
4.97V |
29.6mV |
| AC Power |
1055W |
| Efficiency |
90.08% |
| Power Factor |
0.96 |
.
The 12V rail started out at 12.18V in Test 1, and dropped to 12.08V at maximum load. This gives us 0.18V (1.5%) regulation, and a drop of 0.1V (0.8%). The 5V rail was 5.1v during Test 1, and dropped to 5.04V in Test 14, which gives us 0.1V, or 2% regulation, and a 0.06V, or 1.2% drop. The 3.3V rail started at 3.34V in Test 1, and dropped to 3.25V during Test 14. This equates to 0.05V (1.5%) regulation, and a drop of 0.09V, or 2.7%. While this is a good result, it would be nice to have somewhat tighter regulation on the 3.3V rail.
The efficiency was good enough to clear 80plus gold, and it peaked at just over 92%. I was able to overload the unit to about 950W – a full 200W over the labelled maximum. I used the turbo-charge feature during this test. As well as increasing the fan speed, it also turns the fan’s LEDs from blue to red, but causes a slight drop in the efficiency.
| Rail |
Test 14 (749.87W) |
Overload Test (950.36W) |
| 12V |
 |
 |
| 5V |
 |
 |
| 3.3V |
 |
 |
| -12V |
 |
 |
| 5Vsb |
 |
 |
.
The ripple was generally very well suppressed, with the three major rails staying well within allowable limits at all times. The -12V rail had an unusual quirk. With the unit loaded between 300W and 450W, this happened…
_ 
Those are the oscilloscope shots from the -12V rail during Tests 6 and 7. The ripple was way above the maximum allowed 120mV, exceeding 500mV at times. During Test 9, the ripple had mostly settled down again, and was back down to around 11mV for the most part, but there were a few spikes which would push it up to around 60mV. In Test 10, it was completely back to normal. The problem only re-occurred when I attempted to load the unit higher than 950W. The ripple on the +12V output also increased during these tests, but it was still below half the maximum allowed.
I tested two samples, and both exhibited this behaviour, so it seems that this is a design flaw with these units, and not just a manufacturing defect. That said however, I don’t think that this is a serious enough problem to completely fail the unit over. In fact, many reviewers don’t even test the -12V rail these days. It was only used in PCI slots, as well as serial ports. If you are using it with a modern PC which has no serial ports, and only PCI-Express slots, then it won’t even get used. I’ll just have to have a little think about how many points to knock off as I disassemble the unit.
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