Testing results
Our Chroma load-testing procedures can be found at this link.
Efficiency
| Load | 10% | 25% | 50% | 75% | 100% |
|---|---|---|---|---|---|
| Efficiency | 83.1% | 90.9% | 93.0% | 90.4% | 88.5% |
Very few supplies manage over 90 per cent efficiency across a wide load. Considered across the range most would use - 25 per cent to 75 per cent - SilverStone does manage that magic 90 per cent figure.
Regulation
In terms of regulation, we're looking at just how well the supply is able to hold to the various lines. The ATX spec. has a +/- 5 per cent leeway on all but the -12V line.
| Line/Load | 3.3V | 5V | 12V |
|---|---|---|---|
| 10 per cent | +0.4% | +1.1% | +1.4% |
| 50 per cent | -0.5% | +0.8 | +0.8% |
| 100 per cent | -1.6% | -0.5% | +0.2% |
SilverStone claims tight regulation in the Strider Essential Gold's accompanying literature. We see that borne out as the maximum fluctuation is less than two per cent.
Regulation - cross-load
How about providing uneven loads that stress particular voltage rails? In the first attempt, we've put 35A on the 12V rails, and 1A on the 3.3V and 5V rails. This can actually be somewhat typical for a system heavy on graphics and CPU power. In the second, we've turned the tables and gone for 12A on both the 3.3V and 5V rails - highly unlikely in a real-world environment - and just 2A on the 12V - even more unlikely.
| Line/Load | 3.3V | 5V | 12V |
|---|---|---|---|
| Cross-load 12V focus | +1.2% | +1.0% | -1.0% |
| Cross-load 3.3V/5V focus | -2.0% | -1.1% | +2.0% |
Hammering one part of the PSU power delivery while using just a small portion of the other can throw cheaper supplies out of kilter. Regulation isn't quite as tight, naturally, but on a par with other 80 PLUS Gold supplies we've seen recently.
Ripple
| Line/Load (mv - p-p max) | 3.3V | 5V | 12V |
|---|---|---|---|
| 10 per cent | 10mV | 10mV | 20mV |
| 50 per cent | 15mV | 20mV | 30mV |
| 100 per cent | 30mV | 30mV | 40mV |
The ATX v2.2 spec states that the maximum permissible ripple is 120mV for the 12V line and 50mV for others.
PSUs convert AC power into DC, but doing so requires the AC waveform to be suppressed. What we're really testing here is the quality of the supply's rectifier and any smoothing capacitors in getting rid of this unwanted up-and-down ripple. Performance is well within ATX specifications but not as sharp as found on the similar EVGA SuperNOVA.
Temps
| Temperatures | Intake | Exhaust |
|---|---|---|
| 10 per cent | 28°C | 36°C |
| 50 per cent | 33°C | 41°C |
| 100 per cent | 38°C | 47°C |
Fan performance
Temps are good but they mean little in isolation. Obtaining accurate noise readings is near-on impossible when the supply is connected to the Chroma test harness and dual-unit load-tester. We can test the manufacturer's quietness claims in a different way, by using an AMPROBE TMA10A anemometer placed directly over the centre of the PSU. The anemometer records the airflow being pushed/pulled from the PSU's fan. We can use a Voltcraft DT-10L RPM meter to measure the rotational speed of the fan, too.
| Load | Fan RPM | Airflow | Noise |
|---|---|---|---|
| 10 per cent | 700rpm | circa-20cfm | Very quiet |
| 50 per cent | 1,100rpm | circa-35cfm | Quiet |
| 100 per cent | 2,000rpm | circa-70cfm | Noticeable |
You won't hear the fan under normal conditions. The story changes if you manage to use more than 400W as the noise escalates rather quickly.
