We made several tests with this power supply as described in the article Hardware Secrets Power Supply Test Methodology.
First we tested this power supply with five different loads patterns, trying to pull around 20%, 40%, 60%, 80% and 100% of its labeled maximum capacity (under “% Max Load” we list the actual percentage that was used), watching how the reviewed unit behaved under each load. On the table below we list the load patterns we used and the results for each load. Then we tried to pull even more power from this unit and the results for this test are on next page.
If you add all the powers listed for each test you may find a value different from what posted under “Total” below. Since each output can have a slight variation (e.g. +5 V output working at 5.10 V) the actual total amount of power being delivered is slightly different from the calculated value. On “Total” row we are using the real amount of power being delivered, as measured by our load tester.
+12V2 is the second +12V input from our load tester and during our tests we connected the power supply EPS12V connector to it, which is connected to the power supply +12V1 and +12V2 rails. The +12V1 input from our load tester was connected to the +12V3 (main motherboard cable), +12V4 (peripheral connectors) and +12V2 (video card auxiliary cable) rails at the same time.
Input | Test 1 | Test 2 | Test 3 | Test 4 | Test 5 |
+12V1 | 5 A (60 W) | 11 A (132 W) | 17 A (204 W) | 24 A (288 W) | 33 A (396 W) |
+12V2 | 5 A (60 W) | 10 A (120 W0 | 15 A (180 W) | 20 A (240 W0 | 22 A (264 W) |
+5V | 2 A (10 W) | 4 A (20 W) | 6 A (30 W) | 8 A (40 W) | 8 A (40 W) |
+3.3 V | 2 A (6.6 W) | 4 A (13.2 W) | 6 A (19.8 W) | 8 A (26.4 W) | 8 A (26.4 W) |
+5VSB | 1 A (5 W) | 1 A (5 W) | 1.5 A (7.5 W) | 2 A (10 W) | 2 A (15 W) |
-12 V | 0.5 A (6 W) | 0.5 A (6 W) | 0.5 A (6 W) | 0.5 A (6 W) | 0.8 A (9.6 W) |
Total | 149.5 W | 299.4 W | 450.8 W | 613.8 W | 754.2 W |
% Max Load | 19.9% | 39.9% | 60.1% | 81.8% | 100.6% |
Room Temp. | 47.9º C | 47.9º C | 48.8º C | 48.6º C | 50.9º C |
Voltage Stability | Pass | Pass | Pass | Pass | Pass |
Ripple and Noise | Pass | Pass | Pass | Pass | Pass |
AC Power | 175.0 W | 340.0 W | 518.0 W | 717.0 W | 906.0 W |
Efficiency | 85.4% | 88.1% | 87.0% | 85.6% | 83.2% |
Final Result | Pass | Pass | Pass | Pass | Pass |
This power supply could not only deliver its labeled power at 50º C, but more than that (see results on next page).
Efficiency was the highlight from this product. It could deliver at least 83% efficiency when fully loaded, peaking 88% when delivering 40% of its nominal 750 W capacity (300 W).
Ripple and noise where below the maximum allowed, even though models from some other manufacturers can deliver a lower noise level at their +12 V outputs when their units are delivering their full load. Just to remember, the maximum allowed for the +12 V outputs is 120 mV peak-to-peak and the maximum allowed for the +5 V and +3.3 V outputs is 50 mV peak-to-peak. Below you see noise levels for the reviewed power supply delivering 750 W (test number five).
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Figure 15: Noise level at +12V1 input from our load tester with the reviewed unit delivering 750 W (74.2 mV).
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Figure 16: Noise level at +12V2 input from our load tester with the reviewed unit delivering 750 W (83 mV).
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Figure 17: Noise level at +5 V input from our load tester with the reviewed unit delivering 750 W (14.2 mV).
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Figure 18: Noise level at +3.3 V input from our load tester with the reviewed unit delivering 750 W (21.6 mV).
Let’s now see how much power we could pull from this unit keeping it working inside ATX specs.
