FSP Twins 500W Redundant Power Supply

PRODUCT: Twins 500W Redundant
PROD LINK: Twins 500W Product Page
PRICE: $399.00 @ NewEgg
Price is at time of testing!

FSP Twins 500W

As mentioned, the software only needs a USB connection to the unit to start working, and will tell you repeatedly in a tool tip if either or both modules aren’t running. Good. Proper spelling is also good, just so my head stops herting.

We have three monitoring sections to the home screen Рone per module, and one for the frame in total. All in all, the software works very well, and Engrish aside, actually works much better than most units that come with software monitoring. It just installs and works. Easy peasy.

FSP Twins 500W

The info screen shows us some basic info about the firmware, the serial number, and some contact info in case you have some issues. This is semi-transparent, as you can somewhat make out by the outline of my scope software beneath.

FSP Twins 500W

You also get the ability to see what each module does over the long haul on this here report screen.

FSP Twins 500W

Finally, here’s the setup screen, where you can customize the colors, input your electricity rate, and switch the temperature between metric and heathen measurements. I’m not exactly sure what the modular indication settings are supposed to do… never got those settings to stick, and I didn’t have time to look into that in depth.

FSP Twins 500W

This is a screenshot taken during test one, cold, just to give you an idea how the software differs from reality. Most units like this aren’t very accurate at low loads, due to the costs involved of getting accurate measurements at low loads. Even my Rek meter isn’t all that good compared to the $2500 power analyzers used by 80 Plus.

In this case, the software reports a combined output of 50 watts vs. 50.6 watts in reality. So that part’s pretty close to being dead on.

The Rek reported 73 watts at the wall. The software does not give AC line power draw, but it does tell you the voltage and current, which comes out to 79.16 watts. Not so accurate, there.

Let’s go to test five, hot, and look at the numbers again.

FSP Twins 500W

495W output reported, 492.3W actually measured. Still pretty close. On the line input side of it, I measured 559.1W with the Rek, while computing with the software numbers gives me 561.13W.

So it’s still reporting high on the AC side of things, but is much closer to being accurate. Just like every other unit I test with software monitoring.

And yes, I do find it interesting that one module’s doing more work than the other. You’ll never get a perfectly dead even split between the two, but this goes to highlight again that it should be possible to tweak the balance for better low load efficiency. Hopefully, FSP can get on that.

Now, for kicks, let’s see what happened when I unplugged one module during test five, hot.

FSP Twins 500W

Yeah, that little fan was really moving. It didn’t just gradually ramp up, either – it went right up there immediately. You want that in a redundant unit, because slow and steady can burn out the other module in some cases before you can replace the dead one.

Time to take some stuff apart.