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Load 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 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 input was connected to the +12V1 and +12V2 rails, while the +12VB input was also connected to the +12V1 and +12V2 rails.

Input Test 1 Test 2 Test 3 Test 4 Test 5
+12VA 3.5 A (42 W) 7 A (10.5 W) 10.5 A (126 W) 14 A (168 W) 17.5 A (210 W)
+12VB 3.5 A (42 W) 7 A (10.5 W) 10.5 A (126 W) 14 A (168 W) 17 A (204 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 104.1 W 197.0 W 300.1 W 402.4 W 503.4 W
% Max Load 20.8% 39.4% 60.0% 80.5% 100.7%
Room Temp. 46.1° C 44.5° C 44.3° C 44.8° C 46.1° C
PSU Temp. 51.1° C 51.4° C 55.7° C 56.4° C 58.0° C
Voltage Regulation Pass Pass Pass Pass Pass
Ripple and Noise Pass Pass Pass Pass Pass
AC Power 117.4 W 217.0 W 331.1 W 448.5 W 569.5 W
Efficiency 88.7% 90.8% 90.6% 89.7% 88.4%
AC Voltage 114.0 V 112.5 V 111.5 V 110.4 V 109.1 V
Power Factor 0.991 0.996 0.997 0.997 0.998
Final Result Pass Pass Pass Pass Pass

The 80 Plus Gold certification guarantees minimum efficiencies of 87% at 20% load, 90% at 50% load, and 87% at 100% load. In our tests, the FSP Aurum Xilenser 500FLD surpassed these numbers, which is outstanding.

Voltage regulation for the positive voltages was excellent, closer to their nominal values (3% regulation) during all tests. The -12 V output went outside this tighter regulation during tests one (at -11.38 V), two (at -11.47 V), and three (at -11.63 V), but was still inside the proper range. The same thing happened with the +5VSB output during test five, at +4.78 V. 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.

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Gabriel Torres is a Brazilian best-selling ICT expert, with 24 books published. He started his online career in 1996, when he launched Clube do Hardware, which is one of the oldest and largest websites about technology in Brazil. He created Hardware Secrets in 1999 to expand his knowledge outside his home country.