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 Seasonic M12II-750 EVO Edition 750W power supply, we can test it to the maximum.
The above tests represent typical loads that we have measured from various systems and are meant to give a rough idea of where your computer might fall in line with our tests. Please keep in mind that each system is different and actual loads can vary greatly even with similar hardware.
Let's start by taking a look at the voltages to see how well this unit did during testing. Starting with the 12V rail, we see 1% regulation from start to finish with a total drop of .13V. The 5V rail managed to stay within 2% of specification with a total drop of .07V from start to finish. Moving towards the 3.3V rail, we see that regulation was within 2% of specification with a total voltage drop of .09V.
DC Output quality for the Seasonic M12II-750 EVO Edition 750W was great and well within specifications. During Test 1, we saw 10mV of noise on our scope. When we increased the loads in Test 2, the ripple climbed to 13mV at a little under half. During Test 5 under a load of 750W, the oscilloscope showed a maximum of 24mV on noise on the 12V rail.
The Seasonic M12II-750 EVO Edition 750W is rated for 80 PLUS Bronze efficiency. This means that the power supply must perform at 82%/85%/82% efficiency at 20%/50%/100% loads respectively. As you can see, the M12II-750 EVO Edition passed on our bench, and wasn't close to failing at any point.
If there's anything that we've learned from what we've seen today, it is that Seasonic doesn't just make toys only the rich can afford. Seasonic is known for their quality and the M12II-750 EVO Edition is designed from the ground up as a budget unit.
The M12II-750 EVO Edition exhibits the characteristics of both. Inside there are no signs of quality being cut, as the soldering is superb, and the components are just what you'd see in their higher-end power supplies.
When it comes to performance, the M12II-750 EVO Edition outperforms many of the higher-end power supplies that we've reviewed in the past months. Voltage regulation is superb with the 12V rail showing within 1% of specification and the other two rails showing within 2%. DC output quality is great as well, staying under 25mV at full load. The efficiency may not be on par with Platinum level power supplies, but it performs just as it should for a Bronze rated unit.
What really sweetens the deal on the M12II-750 EVO Edition is that it is cheap. At $99.99, it is right on par with a majority of 750W power supplies currently on the market, most of which have shorter warranties and worse performance. Unless you absolutely have to have a power supply with higher efficiency, the Seasonic M12II-750 EVO Edition is going to be hard to beat.