Articles :: Modular Power Supplies: The Reality of the Resistance. ::

Jon Gerow · 08-10-2006 · Category: Guides

Testing Corsair HX620W (continued)

Here you can see that I have the HX620W hooked up to a SunMoon SM-8800 power supply load tester. The main ATX connector and 8-pin EPS connector are hooked up and there is already an 11A load on the +12V leads of these connectors. There is also a 12A load on the +3.3V rail, 15A load on the +5V rail, 2A load on the +5VSB and 0.5A load on the -12V. In other words, the power supply is running with a 250W load on it as if it were plugged into a computer.

What I do from here is gradually increase the load on the PCI-e connector from 0A to 5A to 7A to 9A to, finally, 11A, record the voltages with the DMM and log them in Excel.

The load tester has test points on it so the user can get a DMM reading at the load. In the above photo I have the positive (+) test probe testing the 12V at the load.

The load tester actually has a built in voltmeter (note the 4.93V on the +5VSB in the above photo) and that's what I typically refer to when I use my load tester. But because I'm using a DMM to read the PCB and connector voltages, I wanted to use the same instrument to measure voltages at all three points.


  1. Introduction
  2. Testing Methodology / Testing Corsair HX620W
  3. Testing Corsair HX620W (continued)
  4. Testing Corsair HX620W (results)
  5. Testing Ultra X2 550W
  6. Testing Antec NeoHE 430W
  7. Testing Fortron Source FSP600-80GLC
  8. Testing Silverstone ST65ZF
  9. Charting voltage output results for all five load tests
  10. Side by side comparison charts of voltage output
  11. Conclusion

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