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 FSP Aurum 92+ PT-650M 650W 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 .14V. 12V2 was within 2% regulation from start to finish and also had a total drop of .19V. 12V3 was within 2% regulation from start to finish and also had a total drop of .17V. 12V4 was within 2% regulation from start to finish and also had a total drop of .15V. The 5V rail managed to stay within 2% of specification as well with a total drop of .09V from start to finish. Moving towards the 3.3V rail, we see that regulation was within 3% of specification with a total voltage drop of .11V.
DC Output quality for the PT-650M was good and well within specification. During Test 1, we saw 23mV of noise on our scope. When we increased the loads in Test 2, the ripple climbed to 29mV at a little over half load. During Test 5 under a load of 650W, the oscilloscope showed a maximum of 43mv on noise on the 12Vrail.
The FSP Aurum 92+ PT-650M 650W power supply 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, PT-650M 650W passed on our bench, and wasn't close to failing at any point.
The FSP Aurum 92+ PT-650M 650W power supply represents the next step of progression for FSP and was to be expected.
Several of their units have been right on the edge of 80 PLUS Platinum efficiency and it is nice to see them finally bring a retail unit to the market capable of such efficiency. Judging by the ways we have seen their product cycles go, we wouldn't be surprised to see a higher wattage Platinum rated unit following closely behind this one.
The FSP PT-650M performs extremely well considering the targeted market segment for this unit, which is more entry level than anything. The power supply almost managed to stay within 2% of voltage regulation specifications all the way across and just barely broke into the 3% area with the 3.3V rail. DC output quality is great for an entry level power supply as well and efficiency is spectacular.
The only way that you could ask for more is if you started looking toward enthusiast grade power supplies and then you would blow the price point out of the water. You'd be crazy to not consider the FSP Aurum 02+ PT-650M 650W power supply for your build if low wattage and cost are your primary concerns.