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 SilverStone ST65F-G 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 12V rail, we see 1% regulation from start to finish with a total drop of .06V. The 5V rail managed to stay within 1% of specification with a total drop of .03V from start to finish. Moving towards the 3.3V rail, we see that regulation was within 1% of specification with a total voltage drop of .04V.
DC Output quality for the SilverStone ST65F-G 650W was good and well within specifications. During Test 1, we saw 19mV of noise on our scope. When we increased the loads in Test 2, the ripple climbed to 27mV right at half load. During Test 4 under a load of 650W, the oscilloscope showed a maximum of 41mV on noise on the 12V rail.
The SilverStone ST65F-G 650W 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, the SilverStone ST65F-G 650W passed on our bench, and wasn't close to failing at any point.
SilverStone has built quite a reputation with us here at TweakTown. Everything that they've shown us as far as their power supplies are concerned have always been top notch. From their heavy hitters like the ST1200-G to their tiny ST45SF-G, their power supplies are great examples of what to look for when seeking a quality power supply.
The ST65F-G is another great unit from SilverStone and it holds up to all of the standard and performance characteristics that we've come to expect. The voltage regulation is superb for this unit. All three rails managed to stay within 1% of specifications, which is something that only a handful of units we've seen have ever been able to accomplish. That being said, we've also seen better noise suppression from SilverStone before and we have to say we had hoped for a little bit better performance here.
We also have not seen any non-Japanese capacitors out of SilverStone before and we can't help but wonder if this attributed to the higher than normal noise on the 12V rail that we usually see with SilverStone's units. It is worth mentioning 41mV is still below half of the threshold specified and we're only even talking about this because of the years of precedent that SilverStone has set forth with the unit's we've had our hands on.
The ST65F-G isn't exactly cheap, either. For a 650W power supply, it is definitely more toward the pricey side and we expected this higher price to provide us with the same build quality that we've seen from them in the past. Overall though, the ST65F-G is a good unit, but it is priced a little bit high for what it offers.