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 lower than that of the Lepa G1600-MA, we can only test it to 1000W. Also, our test equipment is only capable of creating four simultaneous loads. As a result, in the graphs below, 12V3 will indicate combined loads for 12V3 and 12V5 on the power supply. 12V4 will indicate combined loads for 12V4 and 12V6 on the power supply.
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 12V1 rail, we saw 2% regulation with a total drop of .17V from start to finish. Looking towards 12V2, we saw 2% regulation with a total drop of .19V. 12V3 faired the best out of all the 12V rails as it stayed within 2% regulation and saw a total drop of .14V. 12V4 was also within 2% regulation and displayed a total drop of .16V. The 5V rail also stayed within 2% voltage regulation and displayed a total drop of .04V. 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 absolutely amazing from start to finish. Starting out, we were barely able to see a ripple on the scope during Test 1 where we measured noise at a low 7mV peak to peak. This steadily, but marginally, increased as the loads also increased. By the time we had reached around 50% load, the unit ripple had crept up to 16mV. Under Test 6, we saw that the noise on the 12V rail had crept up to 18mV. This is representative of 62% of the total output of this power supply.
The Lepa G1600-MA PSU is rated for 80Plus Gold efficiency. This means that the power supply must perform at 87%/90%/87% efficiency at 20%/50%/100% loads respectively. As you can see, the G1600-MA had no trouble achieving this while on our test bench.
There is little to say about the Lepa G1600-MA outside of "wow" or "amazing". When pulling off a power supply of this calibre, you must do it with pure perfection. Lepa has come so close to doing just that and most certainly taken the crown away from Ultra on every single level. The build quality on the Lepa G1600-MA is perfect, both inside out and. You simply couldn't ask for a better built unit. Most impressive is the soldering on the inside of the unit, something most will never see, but we were able to pop the top. The only real comparison I have is high dollar electronics that are used in race applications like Indy Car or even Formula One. I've taken apart a PI Research component before costing upwards of 20K and that is the level of quality Lepa has achieved.
Performance for the G1600-MA is amazing too, as you might expect. Voltages are tight and steady all the way across the board. Perhaps what is most amazing in this area is the DC Output Quality of the unit. The G1600-MA has the lowest noise of just about any power supply we have ever tested and has plenty of room to spare. The unit also does a fantastic job of surpassing the requirements for 80Plus Gold certification.
There are a few things that do hold the unit back from being perfect that we have to bring up. The short three year warranty is just unacceptable from such a quality unit. We feel Lepa could do better even if it is just for consumer peace of mind. There are also the issues of short cables along with forced FDD connectors. Lepa could easily vary the length of the PCI-E cables and include the FDD connectors as adapters to solve this issue, but they didn't. This is an enthusiast product so advanced features with well thought out execution is a must. At this point we are really just looking hard for ways to find something to nit-pick on as the rest of the unit is without fault.
Few will ever need a power supply capable of delivering such power, but for those that will, it is comforting to know that they will find a quality unit. This quality will come with a bit of a hefty price tag, but it's also significantly less than it has been in the past. The performance of this unit proves that it is well deserving of our performance award. It could easily snag the Editor's Choice award with just a few small tweaks here and there. That being said, it is still safe to say the Lepa 1600-MA is the new king of the power supply market. We look forward to abusing it further in our upcoming dual Xeon build.
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