Our load tests utilize a couple of FAST ATE active load testers and a variety of other equipment, including 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 lower than that of the Corsair AX1500i 1500W power supply, we can only test it to 1000W.
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 percent regulation from start to finish, with a total drop of .06V. The 5V rail managed to stay within 2 percent of specification, with a total drop of .05V from start to finish. Moving towards the 3.3V rail, we see that regulation was within 1 percent of specification, with a total voltage drop of .03V.
DC Output quality for the Corsair AX1500i was excellent and well within specifications. During Test One, we saw 5mV of noise on our scope at 15 percent load. When we increased the loads in Test Three, the ripple climbed to a mere 7mV at around 38 percent load. Increasing loads even further showed that the noise on the 12V rail climbed to 12mV at 100W.
The Corsair AX1500i is rated for 80 PLUS Titanium efficiency. This means that the power supply must perform at 90% / 92% / 94% / 90% efficiency at 10% / 20% / 50% / 100% loads, respectively. As you can see, the Corsair AX1500i is performing exactly as would be expected to reach these levels of efficiency.
It is important to note that we are not able to fully load down this power supply, and thus we cannot provide performance results for the unit under 100 percent load. Judging by the performance results that the unit showed during testing, we are very confident that the unit would continue to show outstanding performance results the entire way through.
Corsair redefined what it meant to be an enthusiast power supply when it released the AX1200i almost two years ago. We said back then that it would be the standard for time to come and that many would be scrambling to catch up. Fast forward to today and nobody has been able to touch the combined performance and features of that unit. There have been attempts, and some have come close on features or performance, but nothing is close when combined.
The AX1500i is a direct evolution of AX1200i in almost every way. The performance that we see for a 1500W unit is as close to perfect as we've ever seen, and it is that way across the board. If the 5V rail would have started out just a little bit lower, I think we would be looking at what truly could be a perfect power supply concerning performance.
All of this is before we even consider the fact that we are seeing this happen out of an 80 PLUS Titanium rated power supply. It is typically harder to maintain efficiency with higher wattage units, and Corsair is certainly walking into the ring with their fists raised from the start. They not only pull it off, but do so with the performance backing it.
You can then combine this with the seven-year warranty they back it with, and you've got nothing but a win, even if you have to pay some serious coin to get your hands-on it. The AX1500i may not be a unit that redefines what it means to be an enthusiast grade power supply, but it certainly takes the bar and elevates. It's harder, better, faster, stronger. It is the AX1500i, and it is going the power supply of choice for those who demand nothing less than perfection.
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