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 equal to that of the Enermax Platimax 1000W, we can test it to the maximum.
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 2% regulation from start to finish across all the rails with a total drop of .16V from start to finish. The 5V rail also stayed within 2% voltage regulation and displayed a total drop of .08V. Moving towards the 3.3V rail, we see that regulation was again within 2% with a total voltage drop of .04V.
DC output quality was good from start to finish, but not quite as well as we expected. Starting out, we were barely able to see a ripple on the scope during Test 1 where we measured noise at a low 14mV peak to peak. This steadily increased as the loads also increased. By the time we had reached around 50% load, the unit ripple had crept up to 23mV. Under full load, we saw that the noise on the 12V rail had crept up to 32mV.
The Enermax Platimax 1000W is rated for 80Plus Platinum efficiency. This means that the power supply must perform at 90%/92%/89% efficiency at 20%/50%/100% loads respectively. As you can see, the Platimax 1000W had no trouble achieving this while on our test bench. At no time was the unit close to failing for efficiency.
The Enermax Platimax 1000W power supply is the second Platinum rated 1000W power supply that we have taken a look at to date. The other was the XFX ProSeries 1000W. The Enermax Platimax 1000W unit performs noticeably better all the way around, but does so for nearly $40 more.
As most enthusiasts are aware, the bleeding edge of performance often comes with added costs and the Platimax 1000W power supply is no exception.
Unfortunately for Enermax, we just took a look at the Revolution87+ and found it to be a much better value than the Platimax 1000W unit as it performed almost identically with better DC output quality and costs $50 less.
The Enermax Platimax is a great unit, but it doesn't make any sense to spend the extra money to get the same performance and identical features for a very marginal increase in efficiency that will most likely only amount to pennies of savings on your electric bill.