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

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

Testing Corsair HX620W (results)

Now that you know what I'm doing and how I'm doing it, here's the results of our tests of the Corsair HX620W modular power supply:

The graph shows the drop in voltage from the 0A load as measured at the back of the modular PCB to the 11A load as measured at the load itself... as well as all points in between.

Here we can see many principles of resistance at play. As the load increases, so does the drop in voltage. And as we work our way away from the source of the power, the increase of resistance also results in a drop of voltage.

Going from 0A to 11A, we only drop .02V at the power supply. But at the actual load we drop as much as .12V. At 0A, we only lose .01V at each connector (the modular connector and the connector at the peripheral.) At 5A, we lose 2A at the modular interface connector and .01A at the peripheral. At 7A and 9A loads, we lose .02V at each connector. And finally, at 11A, we lose .03V at the modular interface and .01 at the load.

Interestingly enough, the largest drop in voltage is NOT at the connectors. Along the wires is where we see the biggest loss. We lose .05V even when there is no load on the connector and we lose .13V when there's an 11A load on the PCI-e! Suffice to say, we lose three times as much voltage on an 18" PCI-e connector cable than we lose at the connectors!

At least this the story with the Corsair HX620W. Let's see how the other power supplies I have sitting here do...


  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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