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Ripple and Noise Tests

Voltages at the power supply outputs must be as “clean” as possible, with no noise or oscillation (also known as “ripple”). The maximum ripple and noise levels allowed are 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. We consider a power supply as being top-notch if it can produce half or less of the maximum allowed ripple and noise levels.

The Corsair GS700 Bronze provided extremely low ripple and noise levels, making it a “flawless” unit here as well.

Input Test 1 Test 2 Test 3 Test 4 Test 5
+12VA 6.8 mV 8.8 mV 11.4 mV 15.0 mV 22.4 mV
+12VB 9.0 mV 13.0 mV 17.4 mV 21.6 mV 31.2 mV
+5 V 7.0 mV 7.2 mV 7.0 mV 7.6 mV 8.2 mV
+3.3 V 9.4 mV 11.8 mV 12.4 mV 14.0 mV 17.0 mV
+5VSB 10.0 mV 11.6 mV 13.8 mV 16.8 mV 21.6 mV
-12 V 25.4 mV 38.2 mV 53.0 mV 71.2 mV 87.2 mV

Below you can see the waveforms of the outputs during test five.

Corsair GS700Figure 22: +12VA input from load tester during test five at 700.4 W (22.4 mV)

Corsair GS700Figure 23: +12VB input from load tester during test five at 700.4 W (31.2 mV)

Corsair GS700Figure 24: +5V rail during test five at 700.4 W (8.2 mV)

Corsair GS700Figure 25: +3.3 V rail during test five at 700.4 W (17.0 mV)

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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.