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

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

Side by side comparison charts of voltage output

For the following graphs, I start allof the power supplies, where the voltage is measured at the PCB, at zero. The scale on the left is the amount of voltage each power supply dropped during each test.

First, we'll take a look at what the PCI-e connector looks like with no load on it...

Here we can easily see that we have two power supplies with the greatest amount of voltage drop: .09V from PCB to load. The FSP600-80GLC with the fixed cables and the Antec NeoHE430W modular. The bulk of the FSP's loss was at the cable, while the bulk of the Antec's loss was at the connector.

The two power supplies with the least amount of loss were the Ultra X2 550W and the Silverstone ST65ZF. Interestingly enough, once again we see one modular and one fixed cable power supply running neck and neck.

Below is what the 12V on the PCI-e connectors looked like with a 5A load on it....

At .13V, the Antec NeoHE has broken away from the pack as the power suply with the most amount of voltage loss. Oddly enough, the Ultra X2 550W is still hanging with a fixed cable power supply: The FSP.

Now the 7A load...

Once again, we're seeing the Antec NeoHE 430W losing the most voltage at .15V drop, with the Corsair a close second at .14V. With only a .08V loss, the Ultra X2 550W is still tied with the Fortron Source and has now passed the Silverstone ST65ZF for the top spot!

Next is the 9A load on the PCI-e connector...

The Ultra continues to tie with the FSP for the least drop in voltage from PCB to load. And the Antec NeoHE is still in last, losing as much as .15V just in the cable. This is likely because the NeoHE does not use one to one connections between the power supply and the load.

And finally, the 11A load on the PCI-e connector...

Finally, under the torture of an 11A load on a single connector (more than any PC is going to inflict on a power supply) the FSP comes out as the king by only exhibiting a .10V drop in voltage.

The Ultra comes out in second, which is strange beause this is a modular power supply. The second of the two fixed cable power supplies actually came out in third over all. This was because of the .02A loss at the connector. Why we're losing this much voltage at the connector on the Silverstone PSU, I'm not sure. But because of this, the ST65ZF was beat out by a modular power supply.

And still, the Antec came in last. But not so much because of loss at the modular connector this time, as the NeoHE only lost .02V at the power supply when the Corsair lost .03, but because of the cable. .17V was lost just pushing power through the cable.

Ten pages later, I think it's time for a summary, don't you?


  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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