OCZ ModXStream Pro 500 W Power Supply Review

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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 how the reviewed unit behaved 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 power listed for each test, you may find a different value than what is posted under “Total” below. Since each output can vary slightly (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. On 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 and +12V2 rails, while the +12VB input was connected to the power supply +12V1 rail (EPS12V connector).

Input Test 1 Test 2 Test 3 Test 4 Test 5
+12VA 4 A (48 W) 7.5 A (90 W) 11 A (132 W) 14 A (168 W) 17.5 A (210 W)
+12VB 3 A (36 W) 7 A (84 W) 10.5 A (126 W) 14 A (168 W) 17.5 A (210 W)
+5V 1 A (5 W) 2 A (10 W) 4 A (20 W) 6 A (30 W) 8 A (40 W)
+3.3 V 1 A (5 W) 2 A (6.6 W) 4 A (13.2 W) 6 A (19.8 W) 8 A (26.4 W)
+5VSB 1 A (5 W) 1 A (5 W) 1.5 A (7.5 W) 2 A (10 W) 2.5 A (12.5 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 104.0 W 203.2 W 304.9 W 398.4 W 498.8 W
% Max Load 20.8% 40.6% 61.0% 79.7% 99.8%
Room Temp. 44.5° C 44.2° C 44.7° C 47.6° C 44.8° C
PSU Temp. 45.2° C 45.3° C 46.2° C 49.1° C 48.8° C
Voltage Regulation Pass Pass Pass Pass Pass
Ripple and Noise Pass Pass Pass Pass Pass
AC Power 127.7 W 240.2 W 359.7 W 476.7 W 606.7 W
Efficiency 81.0% 85.0% 85.0% 84.0% 82.0%
AC Voltage 115.6 V 114.7 V 113.6 V 112.2 V 110.6 V
Power Factor 0.951 0.968 0.982 0.984 0.990
Final Result Pass Pass Pass Pass Pass

OCZ ModXStream Pro 500 W can really deliver its labeled power, however during test five it shut down twice. Interesting enough this was exactly the same behavior we’ve seen with the 600 W model.

We were happy to see that the 500 W model has the same highlights from the 600 W model.

Since it has “only” the standard 80 Plus certification, we were expecting to see a unit with 80-82% efficiency across the board, but we are happy to be wrong: OCZ ModXStream Pro 500 W could achieve a high efficiency between 81% and 85% during our tests. These results are almost enough for this unit to get the 80 Plus Bronze certification.

Voltage regulation was outstanding, with all positive voltages within 3% from their nominal values – i.e., values closer to their “face value” than required, as the ATX12V specification allows voltages to be within 5% from their nominal values (10% for -12 V).

And then we have noise and ripple, which were below the maximum allowed, although we’d like to see lower numbers on the +12 V outputs (these results were once again compatible to what we saw on the 600 W version). Below you can see the results during test five. The maximum allowed is 120 mV on +12 V and 50 mV on +5 V and +3.3 V. All these numbers are peak-to-peak figures.

OCZ ModXStream Pro 500 W power supplyFigure 16: +12VA input from load tester at 498.8 W (80.4 mV).

OCZ ModXStream Pro 500 W power supplyFigure 17: +12VB input from load tester at 498.8 W (77.2 mV).

OCZ ModXStream Pro 500 W power supplyFigure 18: +5 V rail with power supply delivering 498.8 W (28.4 mV).

OCZ ModXStream Pro 500 W power supplyFigure 19: +3.3 V rail with power supply delivering 498.8 W (18.4 mV).

Let’s see now if we can pull more power from this unit.

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Author: Gabriel Torres

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.

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