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 higher than that of the OCZ ZS750, we can test it to the maximum.
The OCZ ZS750 does a decent job at voltage regulation for a budget power supply. The unit was able to stay within 2% of specification on both the 5V and 12V rails. This went up a little bit higher on the 3.3V rail as the unit started out in Test 1 showing a maximum of 3.39V. All of the voltages were well within ATX specifications and nothing to be worried about.
DC output quality certainly isn't one of the strongest areas for the ZS750, but it did pass the ATX specifications. The unit started out showing a 17mV ripple on the oscilloscope during Test One and it steadily increased as the loads were ramped up. By Test 3 we were seeing nearly 40mV of noise on the 12V rail and this continued to climb up to 54mV during the full loads of Test 5. We'd like to see better, but you can only get so much out of a sub $100 power supply.
The OCZ ZS750 comes with an 80Plus Bronze efficiency rating, meaning that it must be 82%/85%/82% efficient at 25%/50%/100% loads respectively. Our test unit started off strong with an efficiency of over 84% during Test 1, but seemed to flirt with falling out of specification the rest of the way. In the end, all that matters is that the unit passed our tests and showed that it was worthy of the rating.
As we have seen with several of our recent power supplies, there are certainly some sacrifices that must be made when you are powering a PC on a budget. There is a constant struggle between efficiency, output quality and regulation. Finding the balance between them is the real challenge for making sure the money is well spent.
With the results shown by our tests today, we have to say that OCZ has done a great job with the ZS750. They really have found the "ideal blend of quality, performance and efficiency for power hungry desktops."
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