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 EarthWatts 650W Platinum PSU, 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 rails, we see 2% regulation across the board. 12V4 faired the best with a total drop of .13V from start to finish while 12V2 did the worst and showed a drop of .25V. The 5V rail also stayed within 2% voltage regulation and displayed a total drop of .10V. Moving towards the 3.3V rail, we see that regulation was again within 2% with a total voltage drop of .08V.
DC output quality was great from start to finish and just what we had hoped for. Starting out, we saw a ripple of 18mV on the scope. This slowly increased as we stepped up the loads. By the time we had reached around 50% load, the unit ripple had crept up to 21mV. Under full load, we saw that the noise on the 12V rail had crept up to 34mV.
The Antec EarthWatts 650W power supply 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 EarthWatts 650W performed just as it should have, even if things were very close at the end.
The Antec EarthWatts 650W Platinum power supply is the first Platinum rated unit we have seen from Antec and it doesn't disappoint, especially for an entry level power supply.
Voltage regulation is within 2% across the board. DC output quality is great as well, with only 34mV of noise under full load. Efficiency was right on the mark to make it worthy of the Platinum rating.
The $129.95 MSRP does hurt the unit as it certainly makes it one of the more expensive 650W units on the market. The increased cost of the unit will be offset a bit by the increased efficiency, but will be negligible when compared to an 80Plus Gold rated unit, down to just a few bucks a year.
You may also find that the lack of additional PCI-E connectors limit the viability of the unit if you plan on using multiple GPU's.
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