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Voltage Regulation Tests

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. We consider a power supply as “flawless” if it shows voltages within 3% of their nominal values. In the table below, you can see the power supply voltages during our tests and, in the following table, the deviation, in percentage, of their nominal values.

The XFX PRO 850 W Black Edition Full Modular presented outstanding voltage regulation, with the positive outputs always within 1.60% of their nominal values.

Input Test 1 Test 2 Test 3 Test 4 Test 5
+12VA +12.14 V +12.10 V +12.08 V +12.04 V +12.02 V
+12VB +12.13 V +12.06 V +12.02 V +11.96 V +11.90 V
+5 V +5.02 V +5.01 V +5.01 V +5.00 V +5.00 V
+3.3 V +3.31 V +3.31 V +3.30 V +3.30 V +3.29 V
+5VSB +5.08 V +5.04 V +5.01 V +4.97 V +4.94 V
-12 V -11.53 V -11.70 V -11.88 V 12.09 V -12.30 V
Input Test 1 Test 2 Test 3 Test 4 Test 5
+12VA 1.17% 0.83% 0.67% 0.33% 0.17%
+12VB 1.08% 0.50% 0.17% -0.33% -0.83%
+5 V 0.40% 0.20% 0.20% 0.00% 0.00%
+3.3 V 0.30% 0.30% 0.00% 0.00% -0.30%
+5VSB 1.60% 0.80% 0.20% -0.60% -1.20%
-12 V 3.92% 2.50% 1.00% -0.75% -2.50%

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.