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 equal to that of the Enermax NAXN ADV 650W 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 3% regulation from start to finish with a total drop of .28V. The 5V rail managed to stay within 3% of specification with a total drop of .14V from start to finish. Moving towards the 3.3V rail, we see that regulation was within 3% of specification with a total voltage drop of .11V.
DC Output quality for the NAXN 650W wasn't spectacular, but still well within specification. During Test 1, we saw 25mV of noise on our scope. When we increased the loads in Test 2, the ripple climbed to 36mV at around half load. During Test 4 under a load of 650W, the oscilloscope showed a maximum of 60mV on noise on the 12V rail.
The Enermax NAXN ADV 650W 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 NAXN ADV 650W passed on our bench, and wasn't close to failing at any point.
Up to this point, every single unit that we've tested from Enermax has been a spectacular example of what to look for in a power supply. We've seen high efficiency, excellent voltage regulation, and superb DC output quality all done with great build quality inside and out. Their units have always been feature packed, but have put a bit of a strain on your wallet.
The NAXN ADV 650W power supply sits at the opposite end of the spectrum and is most certainly meant for more entry level gaming than the rest of their lineup. There are many tradeoffs for going with a lower end power supply like this and it starts with basic features like protections and modular cabling, but also ends with reduced build quality such as Chinese capacitors and smaller fans. These are what lead to the test results we've seen today.
The voltage regulation is a bit sloppier than we are used to seeing, but stayed within 3% across the board. DC output quality was also a bit ho-hum, especially at full load. At least the efficiency was spot on to what we expected, but even that isn't great, as it is only 80 PLUS Bronze in this day of Gold and Platinum rated units. Keep in mind though that all of the results we've seen today are well within specifications and presented no problems.
What really is the kicker is the MSRP that Enermax has on the unit. At an MSRP of $99, you'd think that the NAX ADV would be a great deal, but it just seems overpriced compared to the competition. We've taken looks at both the NZXT HALE82 N and Antec EA-650, both of which performed better and have more features for less money and the same wattage with the same or better build quality. Until Enermax makes the price more attractive for the unit or increases the build quality for the NAXN ADV, we see no reason to recommend the unit when there are cheaper options that perform better.