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 under 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 and the +12VB inputs were connected to the power supply’s single +12 V rail (the +12VB input was connected to the power supply’s EPS12V connector).
|Input||Test 1||Test 2||Test 3||Test 4||Test 5|
|+12VA||6 A (72 W)||12 A (144 W)||18 A (216 W)||24 A (288 W)||30 A (360 W)|
|+12VB||6 A (72 W)||12 A (144 W)||18 A (216 W)||24 A (288 W)||29.5 A (354 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||165.1 W||320.9 W||484.4 W||646.4 W||802.6 W|
|% Max Load||20.6%||40.1%||60.6%||80.8%||100.3%|
|Room Temp.||44.8° C||44.6° C||45.9° C||48.3° C||47.0° C|
|PSU Temp.||47.6° C||47.4° C||47.5° C||48.5° C||48.5° C|
|Ripple and Noise||Pass||Pass||Pass||Pass||Pass|
|AC Power||183.8 W||350.9 W||533.0 W||723.0 W||918.0 W|
|AC Voltage||116.8 V||115.0 V||113.0 V||111.0 V||108.6 V|
The 80 Plus Platinum certification promises efficiency of at least 90% under light (i.e., 20%) load, 92% under typical (i.e., 50%) load, and 89% under full (i.e., 100%) load. The Fractal Design Newton R3 800 W matched these numbers, except on the full load tests, where it displayed 87.4% efficiency, below the minimum promised. However, we have to consider that we tested this power supply at almost 50º C, while the 80 Plus certification tests are conducted at 23º C, and efficiency drops as temperature increases. Another explanation is on the AC voltage, which was below 110 V during this particular test.
Let’s discuss voltage regulation on the next page.