Ripple and Noise Tests
We conducted 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 load patterns, trying to pull around 20%, 40%, 60%, 80%, and 100% of its labeled maximum capacity (actual percentage used listed under “% Max Load”), watching the behavior of the reviewed unit und
er each load. In the table below, we list the load patterns we used and the results for each load.
If you add all the powers listed for each test, you may find a different value than what is posted under “Total” below. Since each output can have a slight variation (e.g., the +5 V output working at +5.10 V), the actual total amount of power being delivered is slightly different than the calculated value. In the “Total” row, we are using the real amount of power being delivered, as measured by our load tester.
The +12VA and +12VB inputs listed below are the two +12 V independent inputs from our load tester. During this test, the +12VA input was connected to the power supply +12V1, +12V3, and +12V4 rails, while the +12VB input was connected to the power supply +12V2 rail.
|Input||Test 1||Test 2||Test 3||Test 4||Test 5|
|+12VA||5 A (60 W)||10 A (120 W)||14.5 A (174 W)||19 A (228 W)||23.5 A (282 W)|
|+12VB||5 A (60 W)||10 A (120 W)||14 A (168 W)||19 A (228 W)||23 A (276 W)|
|+5 V||1 A (5 W)||2 A (10 W)||4 A (20 W)||6 A (30 W)||8 A (40 W)|
|+3.3 V||1 A (3.3 W)||2 A (6.6 W)||4 A (13.2 W)||6 A (19.8 W)||8 A (26.4 W)|
|+5VSB||1 A (5 W)||1.5 A (7.5 W)||2 A (10 W)||2.5 A (12.5 W)||3 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)||0.5 A (6 W)|
|Total||141.6 W||269.3 W||393.7 W||524.8 W||646.6 W|
|% Max Load||21.8%||41.4%||60.6%||80.7%||99.5%|
|Room Temp.||45.7° C||44.0° C||45.3° C||47.7° C||49.2° C|
|PSU Temp.||47.7° C||45.8° C||47.0° C||49.6° C||53.6° C|
|Ripple and Noise||Pass||Pass||Pass||Pass||Pass|
|AC Power||155.9 W||290.9 W||429.4 W||581.8 W||727.0 W|
|AC Voltage||118.0 V||116.9 V||115.1 V||113.7 V||111.8 V|
The Antec EarthWatts Platinum 650 W passed our tests with flying colors.
Efficiency was between 88.9% and 92.6% during our tests, matching the values promised by the 80 Plus Platinum certification. At full load the 80 Plus Platinum certification promises 89% efficiency, and we can consider that this unit reaches this level since it was only 0.1% below this level.
Voltage regulation was very good, with all voltages closer to their nominal values than required (three percent regulation), for the -12 V output on all tests and the +3.3 V output at test five (+3.18 V). These outputs were still inside the allowed range. The ATX12V specification states that positive voltages must be within 5% of their nominal values, and negative voltages must be within 10% of their nominal values.
Let’s discuss the ripple and noise levels on the next page.