Load Regulation, Hold-Up Time & Inrush Current
To learn more about our PSU tests and methodology, please check out How We Test Power Supply Units.
Primary Rails And 5VSB Load Regulation
Load Regulation testing is detailed here.
Our hold-up time tests are described in detail here.
The hold-up time we observed exceeded 17ms, while the power-good signal lasted longer than 16ms.
For details on our inrush current testing, please click here.
Measured inrush currents were at normal levels under both voltage inputs.
Load Regulation And Efficiency Measurements
The first set of tests reveals the stability of the voltage rails and the SX650-G’s efficiency. The applied load equals (approximately) 10 to 110 percent of the PSU's maximum load in increments of 10 percentage points.
We conducted two additional tests. During the first, we stressed the two minor rails (5V and 3.3V) with a high load, while the load at +12V was only 0.1A. This test reveals whether a PSU is compatible with Intel's C6/C7 sleep states or not. In the second test, we determined the maximum load the +12V rail could handle with minimal load on the minor rails.
|Test #||12V||5V||3.3V||5VSB||DC/AC (Watts)||Efficiency||Fan Speed||PSU Noise||Temps (In/Out)||PF/AC Volts|
|1||3.576A||1.976A||1.973A||0.981A||64.838||82.269%||1117 RPM||19.4 dB(A)||38.04°C||0.983|
|2||8.189A||2.955A||2.965A||1.181A||129.760||87.294%||1117 RPM||19.4 dB(A)||38.52°C||0.993|
|3||13.156A||3.464A||3.483A||1.381A||194.902||89.754%||1117 RPM||19.4 dB(A)||38.70°C||0.994|
|4||18.128A||3.964A||3.970A||1.583A||259.795||90.430%||1117 RPM||19.4 dB(A)||39.16°C||0.996|
|5||22.775A||4.961A||4.976A||1.786A||324.763||90.430%||1117 RPM||19.4 dB(A)||39.75°C||0.997|
|6||27.436A||5.951A||5.987A||1.991A||389.724||90.114%||1117 RPM||19.4 dB(A)||40.35°C||0.998|
|7||32.109A||6.964A||7.003A||2.196A||454.685||89.461%||1997 RPM||34.1 dB(A)||41.89°C||0.998|
|8||36.796A||7.966A||8.020A||2.401A||519.667||88.794%||2265 RPM||36.8 dB(A)||43.22°C||0.998|
|9||41.934A||8.476A||8.558A||2.404A||584.728||87.917%||2491 RPM||41.0 dB(A)||44.42°C||0.998|
|10||47.041A||8.987A||9.063A||2.508A||649.626||87.191%||2790 RPM||44.7 dB(A)||45.93°C||0.998|
|11||52.553A||8.994A||9.075A||2.510A||714.580||86.381%||2755 RPM||44.6 dB(A)||46.55°C||0.998|
|CL1||0.099A||13.019A||13.006A||0.005A||109.914||81.634%||1117 RPM||19.4 dB(A)||43.82°C||0.992|
|CL2||54.123A||1.003A||1.003A||1.002A||660.507||87.522%||2790 RPM||44.7 dB(A)||45.63°C||0.998|
The +12V rail demonstrated close to 1.3% deviation, while the 5V rail showed off even tighter load regulation at 1.18%. The 3.3V rail performed well enough at around 2.1%, and the 5VSB rail was at 2.64%.
SilverStone's SX650-G easily satisfied the 80 PLUS Gold specification's requirements, even under the tough conditions we applied.
Up through the 60% load test, SilverStone's SX650-G was nearly silent, despite an ambient temperature in the 38-40°C range. The fan kicked in hard during the 70% load test, though, and under full load it hit its peak speed (and close to 45 dB[A] noise).
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