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, both inputs were connected to the power supply’s single +12 V rail. (The power supply’s EPS12V connector was installed on the +12VB input of the load tester.)
|Input||Test 1||Test 2||Test 3||Test 4||Test 5|
|+12VA||4.5 A (54 W)||9.5 A (114 W)||14.5 A (174 W)||19 A (228 W)||25 A (300 W)|
|+12VB||4.5 A (54 W)||9.5 A (114 W)||14.5 A (174 W)||19 A (228 W)||25 A (300 W)|
|+5 V||1 A (5 W)||4 A (20 W)||6 A (30 W)||8 A (40 W)||10 A (50 W)|
|+3.3 V||1 A (3.3 W)||4 A (13.2 W)||6 A (19.8 W)||8 A (26.4 W)||10 A (33 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||137.8 W||278.2 W||417.7 W||543.4 W||703.4 W|
|% Max Load||19.7%||39.7%||59.7%||77.6%||100.5%|
|Room Temp.||45.0° C||45.2° C||46.3° C||47.5° C||45.4° C|
|PSU Temp.||45.2° C||45.8° C||47.3° C||48.5° C||49.2° C|
|Ripple and Noise||Pass||Pass||Pass||Pass||Pass|
|AC Power||170.8 W||327.2 W||489.
|645.0 W||857.0 W|
|AC Voltage||114.4 V||113.1 V||109.1 V||108.4 V||106.2 V|
The 80 Plus Bronze certification guarantees minimum efficiencies of 82% at 20% and full loads, and 85% at 50% load. In our tests, the Xigmatek Tauro 700 W presented 80.7% efficiency at 20% load. Unfortunately, we see this happening time and time again, as the 80 Plus tests are conducted at 23° C and we test power supplies between 45° C and 50° C, and efficiency drops with temperature.
All voltages were closer to their nominal values during all tests (3% voltage regulation), except the +5VSB output during test five, which was at +4.82 V, 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.