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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 XFX PRO 650 W XXX Edition provided extremely low ripple and noise levels.

Input Test 1 Test 2 Test 3 Test 4 Test 5
+12VA 6.6 mV 8.6 mV 10.4 mV 12.8 mV 17.6 mV
+12VB 7.2 mV 9.2 mV 12.4 mV 14.2 mV 19.8 mV
+5 V 4.6 mV 5.0 mV 5.6 mV 6.4 mV 5.6 mV
+3.3 V 6.4 mV 7.8 mV 7.6 mV 8.8 mV 7.2 mV
+5VSB 8.0 mV 12.0 mV 20.0 mV 20.6 mV 12.8 mV
-12 V 13.2 mV 15.2 mV 17.6 mV 23.4 mV 27.4 mV

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

XFX Pro 650w XXX EditionFigure 22: +12VA input from load tester during test five at 644.7 W (17.6 mV)

XFX Pro 650w XXX EditionFigure 23: +12VB input from load tester during test five at 644.7 W (19.8 mV)

XFX Pro 650w XXX EditionFigure 24: +5V rail during test five at 644.7 W (5.6 mV)

XFX Pro 650w XXX EditionFigure 25: +3.3 V rail during test five at 644.7 W (7.2 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.