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 HCG-620m, 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 rail, we see 2% regulation from start to finish with a total drop of .14V from start to finish. 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 dropped to 3% with a total voltage drop of .04V.
DC output quality was okay from start to finish, but could have been better. Starting out, we were clearly able to see a ripple on the scope during Test 1 where we measured noise 25mV peak to peak. This steadily increased as the loads also increased. By the time we had reached around 50% load, the unit ripple had crept up to 33mV. Under full load, we saw that the noise on the 12V rail had crept up to 44mV.
The Antec HCG-620M is rated for 80Plus Bronze efficiency. This means that the power supply must perform at 82%/85%/82% efficiency at 20%/50%/100% loads respectively. As you can see, the Antec HCG-620M had no trouble achieving this while on our test bench. At no time was the unit close to failing for efficiency.
Our review sample of the Antec HCG-620M left us wanting more.
Antec has literally taken the HCG-620, added modular cabling and charged $20 more for the unit. The only difference is that our unit performed worse than the previously tested HCG-620 in almost every area except for DC output quality.
Antec's HCG-620M isn't a bad unit; it just isn't a great unit either. With nothing changing between the units and more than six months in passing, it feels like nothing more than a marketing ploy to extend the lifespan of a current model.
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