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 LEPA G850-MAS 850W 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 2% regulation from start to finish with a total drop of .24V. The 5V rail managed to stay within 2% of specification with a total drop of .10V 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 LEPA G850-MAS 850W was good and well within specifications. During Test 1, we saw 15mV of noise on our scope. When we increased the loads in Test 3, the ripple climbed to 21mV at a little over half load. During Test 5 under a load of 850W, the oscilloscope showed a maximum of 33mV on noise on the 12V rail.
LEPA G850-MAS 850W is rated for 80 PLUS Gold efficiency. This means that the power supply must perform at 87%/89%/87% efficiency at 20%/50%/100% loads respectively. As you can see, G850-MAS 850W passed on our bench, and wasn't close to failing at any point.
It still seems a bit odd to me that a company that has full R&D and production facilities to manufacture some of the best power supplies on the planet, would turn to a direct competitor to manufacture a product for them, but that is exactly what LEPA has done with the G850-MAS, by utilizing CWT to make the power supply for them. Regardless of who makes the power supply and whose label is on the unit, the LEPA G850-MAS is a good unit.
As far as performance is concerned, the G850-MAS is quite a good unit. The power supply manages to keep voltage regulation within 2% across the board for all rails. The DC output quality is very good too, showing no more than 33mV of noise on the 12V rail at full load. Even the efficiency is right where it should be, showing that the unit is deserving of the 80 PLUS Gold rating.
The problem is we've been through this many times and it just happens over and over and over again. The unit performs well, has a decent set of features, and even has a decent price on it. The G850-MAS is an all-around good unit from start to finish, no matter how you look at it. Unfortunately there are plenty of good units already on the market. LEPA is just crowding the market a bit more with the inclusion of the G850-MAS - it doesn't do or have anything to set itself apart from what is already there.
The biggest draw to the G850-MAS for many is simply going to be brand loyalty. It will sell better than others when it goes on sale and it will sit on the shelves, while the others around it go on sale themselves. If you're looking for a good unit that doesn't stand out from the rest, the G850-MAS is well worth your time, consideration, and money... especially if you can find it on sale.