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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 power supply’s +12V1 and +12V3 rails, while the +12VB input was connected to the power supply’s +12V2 rail.

Input Test 1 Test 2 Test 3 Test 4 Test 5
+12VA 5 A (60 W) 10.5 A (126 W) 15.5 A (186 W) 20.5 A (246 W) 26 A (312 W)
+12VB 5 A (60 W) 10.5 A (126 W) 15.5 A (186 W) 20.5 A (246 W) 25.5 A (306 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 153.1 W 302.6 W 452.4 W 600.4 W 703.4 W
% Max Load 21.9% 43.2% 64.6% 85.8% 100.5%
Room Temp. 47.0° C 46.6° C 47.6° C 49.2° C 46.8° C
PSU Temp. 48.6° C 48.7° C 49.2° C 50.3° C 43.2° C
Voltage Regulation Pass Pass Pass Pass Pass
Ripple and Noise Pass Pass Pass Pass Pass
AC Power 171.2 W 334.0 W 505.2 W 684.0 W 812.0 W
Efficiency 89.4% 90.6% 89.5% 87.8% 86.6%
AC Voltage 118.1 V 116.4 V 114.8 V 112.7 V 111.0 V
Power Factor 0.949 0.970 0.982 0.986 0.989
Final Result Pass Pass Pass Pass Pass

The 80 Plus Gold certification promises efficiency of at least 87% under light (i.e., 20%) load, 90% under typical (i.e., 50%) load, and 87% under full (i.e., 100%) load. During our tests, the In Win Commander III 700 W was a tad below the 87% mark at full load under high temperatures. As we always point out, the tests for the 80 Plus certification are conducted at only 23° C, and efficiency decreases as temperature increases. Another explanation is that the AC voltage dropped to 111 V during our test five, and efficiency is lower at lower AC voltages.

Let’s discuss voltage regulation 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.