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 Antec HCP-850 Platinum 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 12V1 rail, we see 2% regulation from start to finish with a total drop of .21V. 12V2 fairs the worst, staying within 2% regulation from start to finish with a total drop of .25V. 12V3 once again stays within 2% regulation with a total drop of .21V. Finally we have 12V4 which fairs the best, staying within 2% regulation once more with a total drop of .19V. The 5V rail managed to stay within 3% of specification with a total drop of .15V from start to finish. Moving towards the 3.3V rail, we see that regulation was within 4% of specification with a total voltage drop of .11V.
DC Output quality for the Antec HCP-850 Platinum 850W was excellent and well within specifications. During Test 1, we saw 7mV of noise on our scope. When we increased the loads in Test 3, the ripple climbed to 14mV at a little over half load. During Test 5 under a full load of 850W, the oscilloscope showed a maximum of 20mV on noise on the 12V rail.
Antec HCP-850 Platinum 850W is rated for 80 PLUS 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, Antec HCP-850 Platinum 850W passed on our bench, and wasn't close to failing at any point.
Antec has quite the reputation for quality units and that is exactly what is expected when looking at one of their new flagship units. Starting by looking at the features, the HCP-850 Platinum starts out very strong. It features a full set of protections and some powerful 12V rails that are all but impossible to overload individually.
More often than not it is the performance of flagship units that separate them from their competitors and that is exactly what separates the HCP-850 Platinum from other options on the market. The Voltage regulation on the 12V rails is relative good. Things stay within 2% across the board for all four of the 12V rails.
Unfortunately, things start going downhill from there as far as voltage regulation is concerned, as the 5V rail slips to 3% regulation and the 3.3V rail goes down to 4% regulation. At least both the DC output quality and efficiency of the unit was superb and close to the best on the market.
The other piece of the puzzle that separates power supplies from the competition is the price. The HCP-850 Platinum is a little bit pricey, especially if you don't find a deal on it. Even if that ends up being the case, it is one of the few high-end multi-rail units left on the market, and if you're in search of the multiple rails, you may just have to pay a little bit more for it.