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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 and +12VB inputs were connected to the power supply’s single +12 V rail. (The +12VB input was connected to the power supply EPS12V connector that is permanently attached to the unit.)

Input Test 1 Test 2 Test 3 Test 4 Test 5
+12VA 6 A (72 W) 13 A (156 W) 19 A (228 W) 25.5 A (306 W) 32 A (384 W)
+12VB 6 A (72 W) 13 A (156 W) 19 A (228 W) 25.5 A (306 W) 31.5 A (378 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 165.6 W 346.6 W 508.6 W 684.8 W 850.2 W
% Max Load 19.5% 40.8% 59.8% 80.6% 100.0%
Room Temp. 46.8° C 45.3° C 45.4° C 46.9° C 49.4° C
PSU Temp. 44.5° C 45.5° C 45.8° C 46.7° C 50.8° C
Voltage Regulation Pass Pass Pass Pass Pass
Ripple and Noise Pass Pass Pass Pass Pass
AC Power 185.1 W 381.3 W 565.1 W 770.0 W 978.0 W
Efficiency 89.5% 90.9% 90.0% 88.9% 86.9%
AC Voltage 117.3 V 115.2 V 113.3 V 111.0 V 108.5 V
Power Factor 0.993 0.997 0.998 0.998 0.998
Final Result Pass Pass Pass Pass Pass

The FSP Aurum Pro 850 W passed our tests, with efficiency between 86.9% and 90.9%, correctly matching the 80 Plus Gold certification, which requires minimum efficiency of 87% at light (i.e., 20%) and full loads, and minimum efficiency of 90% at typical (i.e., 50%) loads.

Voltage regulation was excellent, with all voltages closer to their nominal values (3% regulation) during all tests, except for the -12 V output during test one (at -11.61 V) and +5VSB output at test five (at +4.83 V). These outputs, however, 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.

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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.