Load Testimg
Test 1 (118.83W Load – Cold)
| Rail |
Load |
Voltage |
Ripple |
| 12V |
4.9A |
12.25V |
26.8mV |
| 5V |
5.04A |
5.04V |
7.2mV |
| 3.3V |
10.06A |
3.32V |
7.2mV |
| -12V |
0A |
-11.92V |
11.2mV |
| 5Vsb |
0A |
5.05V |
36.8mV |
| AC Power |
146.26W |
| Efficiency |
81.24% |
| Power Factor |
0.71 |
.
Test 2 (210.84W Load – Cold)
| Rail |
Load |
Voltage |
Ripple |
| 12V |
9.85A |
12.31V |
37.2mV |
| 5V |
10.0A |
5.0V |
9.0mV |
| 3.3V |
10.06A |
3.32V |
8.8mV |
| -12V |
0.1A |
-11.93V |
22.0mV |
| 5Vsb |
1A |
5.01V |
19.4mV |
| AC Power |
256.47W |
| Efficiency |
82.21% |
| Power Factor |
0.73 |
.
Test 3 (268.64W Load – Cold)
| Rail |
Load |
Voltage |
Ripple |
| 12V |
14.64A |
12.20V |
46.4mV |
| 5V |
10.04A |
5.02V |
12.0mV |
| 3.3V |
10.06A |
3.32V |
10.0mV |
| -12V |
0.1A |
-12.03V |
25.2mV |
| 5Vsb |
1A |
5.01V |
21.8mV |
| AC Power |
327.54W |
| Efficiency |
82.02% |
| Power Factor |
0.76 |
.
Test 4 (324.89W Load – Cold)
| Rail |
Load |
Voltage |
Ripple |
| 12V |
19.38A |
12.11V |
53.4mV |
| 5V |
10.06A |
5.03V |
15.4mV |
| 3.3V |
10.06A |
3.32V |
11.0mV |
| -12V |
0.1A |
-12.12V |
29.8mV |
| 5Vsb |
1A |
5.01V |
22.4mV |
| AC Power |
400.46W |
| Efficiency |
81.13% |
| Power Factor |
0.77 |
.
Test 5 (376.76W Load – Warm)
| Rail |
Load |
Voltage |
Ripple |
| 12V |
23.92A |
11.96V |
62.4mV |
| 5V |
10.1A |
5.05V |
16.6mV |
| 3.3V |
10.06A |
3.32V |
12.6mV |
| -12V |
0.1A |
-12.25V |
36.2mV |
| 5Vsb |
1A |
5.01V |
155.6mV |
| AC Power |
474.83W |
| Efficiency |
79.35% |
| Power Factor |
0.77 |
.
Test 6 (402.97W Load – Hot)
| Rail |
Load |
Voltage |
Ripple |
| 12V |
26.2A |
11.91V |
67.2mV |
| 5V |
10.12A |
5.06V |
21.6mV |
| 3.3V |
10.06A |
3.32V |
13.4mV |
| -12V |
0.1A |
12.35V |
45.6mV |
| 5Vsb |
1A |
5.01V |
163.2mV |
| AC Power |
513.97W |
| Efficiency |
78.40% |
| Power Factor |
0.77 |
.
Test 7 (452.11W Load – Hot)
| Rail |
Load |
Voltage |
Ripple |
| 12V |
30.63A |
11.78V |
78.6mV |
| 5V |
10.16A |
5.08V |
25.8mV |
| 3.3V |
10.06A |
3.32V |
14.6mV |
| -12V |
0.1A |
-12.49V |
50.4mV |
| 5Vsb |
1A |
5.09V |
165.2mV |
| AC Power |
600.49W |
| Efficiency |
75.29% |
| Power Factor |
0.76 |
.
The Infinity 450’s Voltage regulation wasn’t too bad, in that none of the voltages went out of spec. However, they did vary quite a bit, especially on the 12V rail. It’s highest value was 12.31V during Test 2, which equates to 2.58% regulation. It dropped to 11.78V during Test 7, which equates to a 4.42% drop. That’s quite a drop, considering how many PSUs can manage 1% or less. The 5V rail varied between 5.0V (Test 2) and 5.08V (Test 7), which equates to 1.6% regulation. The 3.3V rail stayed at 3.32V throughout the testing, which equates to 0.61% regulation.
The efficiency was bad. The highest it got to was just over 82%. A similar power supply used in the USA with a lower input voltage would probably have had less than 80% efficiency the whole time. The power factor was above 0.7 the whole time. It’s a better result than products which lack Power Factor Correction (PFC) altogether, but it’s still not as good as what could be achieved using Active PFC.
| Rail |
Test 6 (402.97W) |
Test 7 (452.11W) |
| 12V |
 |
 |
| 5V |
 |
 |
| 3.3V |
 |
 |
| -12V |
 |
 |
| 5Vsb |
 |
 |
.
The ripple suppression was generally acceptable, but shortly after Test 5 began, the ripple on the 5VSB rail went from just over 20mV to around 150mV – three times the maximum allowable limit. I believe this to be heat related. After completing the load tests, I turned the power supply off, allowed it to cool, and re-ran Test 7, and the ripple went back down to 20mV. Test 5 was also where the exhaust air from the load tester was really beginning to warm up. I opted not to overload this power supply, because we already know what its limit is.
The 12V rail’s ripple suppression was unremarkable. It was just above half the maximum limit at higher loads, but was still acceptable. The other rails had very good ripple suppression, staying below half the maximum limit at all times.
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