XFX PRO 850 W Black Edition Full Modular Power Supply Review

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.