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 lower than that of the Silverstone Zeus 1350W power supply, we can only test it to 1000W. Also note that for testing purposes, we will be testing the power supply in single rail mode.
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.
Something that we don't normally have present here are two result tables for one power supply. The table above represents the unit out of the box without any adjustments.
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 .12V. The 5V rail managed to stay within 2% of specification with a total drop of .07V from start to finish. Moving towards the 3.3V rail, we see that regulation was within 2% of specification with a total voltage drop of .07V.
DC Output quality for the Zeus 1350W was superb and well within specification. During Test 1, we saw 7mV of noise on our scope. When we increased the loads in Test 4, the ripple climbed to 14mV at a little over half load. During Test 6 under a load of 1000W, the oscilloscope showed a maximum of 20mv on noise on the 12V rail.
The Silverstone Zeus 1350W power supply is rated for 80 PLUS Silver efficiency. This means that the power supply must perform at 85%/88%/85% efficiency at 20%/50%/100% loads respectively. As you can see, the Zeus 1350W passed on our bench, and wasn't close to failing at any point.
The above results are after taking the time to adjust voltages on each rail and making sure everything was stable. As you can see, very little changed concerning efficiency and DC output quality, but the voltage regulation results changed drastically. All three rails were able to be tuned to within 1% regulation and much tighter than anything we've ever been able to produce before.
There are currently just over a handful of true enthusiast style power supplies on the market right now and the Zeus is competing for a spot in which those who seek a power supply of this level demand the absolute best, no matter the cost. It is safe to say that the Zeus deserves one of these spots on performance alone as the above results speak clearly as to what the unit is capable of.
It doesn't seem like anything special out of the box as the numbers from the first result chart don't differentiate it from any of the other Silverstone power supplies that we've seen. In fact, it fairs slightly worse due to the lack of efficiency. That drastically changes when you add in the ability to tune the voltages to the levels we were achieving. It becomes and overclocker's dream unit as it produces clean power at the voltage levels you desire.
We're glad to see Silverstone bring the Zeus to market for high-end overclockers and we expect this to become the power supply of choice for many wishing to take their overclocking above and beyond. I hope to see Silverstone keep the Zeus around and would love to see them mix it with capabilities of the Corsair AXi series power supplies.
Perhaps a future revamp of the Zeus can add such features and make this the best power supply ever released to the consumer.