Our load tests utilize a couple of FAST ATE active load testers and a variety of other equipment such as an oscilloscope, power conditioner, temperature probe and a power consumption meter. You can read more about our standard testing approach here.
The tests performed are based around six conceivable setups that are out there and progressively load down the PSU up to the power supply's limits or 1000W, whichever comes first. Since our test equipment's limits are greater than that of the FSP AU-700 PSU, we can test it to the maximum.
FSP's AURUM AU-700 passes all of our tests with ease. Voltage readings started within 2% regulation across the board on all 12V rails and both minor rails. All readings started off a tad higher than we would have liked to have seen, but settle down right where they should be as soon as you get a decent load on the AU-700. All voltage drops were consistant and expected as the loads were increased and once the unit is under full load, the readings are almost perfect.
Ripple on the 12V rail started out at 18mV peak to peak and slowly crept up from there as the loads were increased. Increasing the loads to that of Test 2 brought the ripple up to 26mV, and moving up to Test 3 nudged things just a tad higher to 32mV. We saw the largest increase in noise on the 12V rails when we put the AU-700 power supply under full load, reaching a maximum of 41mV peak to peak. While this certainly isn't an exceptionally low reading on the scope, it is still in the good range.
Efficiency is certainly something that the FSP AU-700 excels at. Starting things off during the first test, we saw over 89% efficiency out of the AU-700. Efficiency peaked at 91.1% during Test 2 and slowly fell from there as the loads were increased. Eventually the efficiency settled in at 88.2% under full load. It is great to see that the AU-700 is very efficient from start to finish.
Overall, we were very pleased with the performance out of the FSP AU-700. The unit has good voltage regulation and does a good job of keeping the noise down on the 12V rails as well. FSP also gives you a good selection of cables and connectors which is quite important considering that all of the cables are native to the AU-700. Where the AU-700 really excels is in the efficiency department. Unless you plan on torturing this power supply with a continuous full load the entire time, it is going to spend most of its time in a state of 89% efficiency or higher.
FSP's AU-700 is far from being the cheapest unit on the market in the 650W-750W range, but at under $130, it isn't the most expensive either. It's priced perfectly for just what you get; a solid power supply all the way around, lacking just a couple bells and whistles. The high efficiency will help offset some of the initial cost of the unit over time and the five year warranty helps make it worthwhile too. Just don't go around bragging to your friends about how cool your new PSU is because it has better 'Arrow Dynamics' than a Formula 1 car.
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