Zippy Serene 600W PSU tested at 89% Efficiency

Zippy claims 86% efficiency on the box, but this is a very nice statement that we unfortunately see all the time. We were happily surprised in this case, as we have reached the same efficiency levels stated on the box. With 115VAC (like Zippy most likely has in Taiwan as well) we measure 86% efficiency. Since we know that with rising input voltages the efficiency rises as well, we can of course achieve even higher efficiency ratings. At room temperatures and 230VAC we got an incredibly high efficiency of 88.71%. That's the highest score we have seen so far. Good results can be achieved starting at just around 100W. The best efficiency will be gained by pulling a little more than 200W out of this power supply.