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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 +12V1 rail, while the +12VB input was connected to the power supply +12V2 rail.

Input Test 1 Test 2 Test 3 Test 4 Test 5
+12VA 4 A (48 W) 9 A (108 W) 13 A (156 W) 17.5 A (210 W) 21.5 A (258 W)
+12VB 4 A (48 W) 9 A (108 W) 13 A (156 W) 17.5 A (210 W) 21 A (252 W)
+5 V 1 A (5 W) 2 A (10 W) 4 A (20 W) 6 A (30 W) 10 A (50 W)
+3.3 V 1 A (3.3 W) 2 A (6.6 W) 4 A (13.2 W) 6 A (19.8 W) 10 A (33 W)
+5VSB 1 A (5 W) 1 A (5 W) 1.5 A (7.5 W) 2 A (10 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 113.6 W 238.6 W 350.6 W 472.5 W 595.8 W
% Max Load 18.9% 39.8% 58.4% 78.8% 99.3%
Room Temp. 46.6° C 45.1° C 45.7° C 47.9° C 49.3° C
PSU Temp. 49.7° C 49.0° C 49.0° C 49.8° C 52.2° C
Voltage Regulation Pass Pass Pass Pass Pass
Ripple and Noise Pass Pass Pass Pass Pass
AC Power 133.6 W 275.5 W 411.6 W 568.4 W 742.8 W
Efficiency 85.0% 86.6% 85.2% 83.1% 80.2%
AC Voltage 119.1 V 117.9 V 116.3 V 114.5 V 113.5 V
Power Factor 0.956 0.981 0.989 0.993 0.995
Final Result Pass Pass Pass Pass Pass

The Enermax NAXN 80+ 600 W can really deliver its labeled wattage at high temperatures.

Efficiency was high when we pulled between 20% and 80% of the labeled wattage (i.e., between 120 W and 480 W), ranging from 83.1% and 86.6%. At 600 W, efficiency dropped to 80.2%, matching the standard 80 Plus certification.

Voltages were always inside the allowed range (±5% for the positive voltages and ±10% for the negative voltages), but above the ±3% tolerance that we like to see to consider a power supply “flawless.” For example, during test one, the +5 V output was at +5.20 V, and during test five, this same output was at +4.80 V, while the +12 V output was at +11.57 V.

Noise and ripple levels were always very low. Below you can see the results for the power supply outputs during test number five. The maximum allowed is 120 mV for +12 V and -12 V outputs, and 50 mV for +5 V, +3.3 V and +5VSB outputs. All values are peak-to-peak figures.

Enermax NAXN 80+ 600 W power supplyFigure 17: +12VA input from load tester during test five at 595.8 W (51.4 mV)

Enermax NAXN 80+ 600 W power supplyFigure 18: +12VB input from load tester during test five at 595.8 W (56.8 mV)

Enermax NAXN 80+ 600 W power supplyFigure 19: +5V rail during test five at 595.8 W (9.6 mV)

Enermax NAXN 80+ 600 W power supplyFigure 20: +3.3 V rail during test five at 595.8 W (14.4 mV)

Let’s see if we can pull more than 600 W from this unit.

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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.