SilverStone Strider Platinum 750W Power Supply Review

Load Regulation, Hold-Up Time And Inrush Current

To learn more about our PSU tests and methodology, please check out How We Test Power Supply Units. 

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Primary Rails And 5VSB Load Regulation

Load Regulation testing is detailed here.

Hold-Up Time

Our hold-up time tests are described in detail here.

The recorded hold-up time is much lower than the ATX spec's 17ms minimum requirement. Given the bulk cap's low capacity, this comes as no surprise to us. At least the power-good signal drops before the rails go out of spec, and not after like we saw from Zalman's ZM750-EBT, based on the same platform.

Inrush Current

For details on our inrush current testing, please click here.

The lack of an NTC thermistor for protection against large inrush currents results in over 100A of inrush current with 115V input and a greater than 70A reading with 230V. Sirfa must bring this down as soon as possible. We can't help but wonder why the company chose not to include a simple NTC thermistor at next to no cost.

Load Regulation And Efficiency Measurements

The first set of tests explores voltage rail stability and efficiency. The applied load equals (approximately) 10 to 110 percent of the supply's maximum 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 0.10A. This test reveals whether a PSU is Haswell-ready or not. In the second test, we determined the maximum load the +12V rail could handle with minimal load on the minor rails. 

Test #12V5V3.3V5VSBDC/AC (Watts)EfficiencyFan Speed (RPM)Noise (dB[A])Temps (In/Out)PF/AC Volts
14.371A1.972A1.961A0.991A74.7887.41%0049.79 °C0.971
12.169V5.069V3.361V5.044V85.5536.51 °C115.1V
29.782A2.958A2.955A1.191A149.7090.25%132034.938.51 °C0.988
12.152V5.053V3.348V5.028V165.8739.91 °C115.1V
315.561A3.475A3.474A1.396A224.8791.53%130034.738.84 °C0.994
12.132V5.038V3.335V5.008V245.6740.92 °C115.1V
421.357A3.983A3.970A1.601A299.7591.50%142036.640.26 °C0.996
12.107V5.022V3.323V4.988V327.6043.17 °C115.1V
526.833A4.988A4.983A1.811A374.6791.19%150037.841.29 °C0.996
12.083V5.004V3.309V4.968V410.8545.39 °C115.0V
632.337A6.021A6.008A2.021A449.6890.74%153037.942.09 °C0.996
12.057V4.983V3.295V4.947V495.5846.72 °C115.0V
737.870A7.049A7.038A2.230A524.6090.12%160040.543.24 °C0.996
12.029V4.962V3.282V4.927V582.1448.71 °C115.0V
843.428A8.097A8.080A2.446A599.5889.45%163039.444.90 °C0.997
12.001V4.941V3.267V4.904V670.3351.06 °C115.0V
949.451A8.632A8.635A2.450A674.6188.73%163039.446.23 °C0.997
11.972V4.925V3.253V4.890V760.2753.73 °C115.0V
1055.254A9.171A9.170A3.091A749.4787.85%163039.447.17 °C0.997
11.941V4.906V3.238V4.850V853.0956.07 °C115.0V
1161.661A9.197A9.211A3.099A824.3187.00%163039.447.89 °C0.998
11.914V4.892V3.224V4.837V947.4558.47 °C115.0V
CL10.100A14.022A14.005A0.004A117.6682.61%1630 39.446.32 °C0.985
12.144V4.974V3.333V5.074V142.4352.03 °C115.1V
CL262.459A1.002A1.003A1.002A759.4688.66%1630 39.447.45 °C0.997
11.948V4.969V3.261V4.940V856.5856.46 °C115.0V

Load regulation is merely average on all rails. The ST75F-PT clearly cannot match its competition in this area. Under 20 percent load, the unit manages to satisfy the 80 Plus Platinum requirement. That's not the case at 50 percent of its max-rated capacity or full load, however. While we expected better efficiency under demanding loads, it seems that high operating temperatures have a significant impact on this PSU's performance.

The fan doesn't spin during the 10 percent load test, and up to the 30 percent test its output noise is low. It only exceeds 40 dB(A) during the 70 percent load test, likely due to a vibration since the fan's noise level drops below 40 dB(A) at full speed. Acoustic output is low overall thanks to a slow-spinning fan. Of course, the fan profile does get aggressive at high temperatures, which is why SilverStone rates its PSU for full-load operation at up to only 40 °C. For the record, the ST75F-PT easily delivered more than its full power at up to 48 °C ambient in our tests.

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  • Karsten75
    When you talk about the Teapo capacitors, you mention they have a 3,000-hour lifetime. That's like 125 days? That can't be right, or somehow the lifetime actually has to be applied differently?
  • Nuckles_56
    Quote:
    When you talk about the Teapo capacitors, you mention they have a 3,000-hour lifetime. That's like 125 days? That can't be right, or somehow the lifetime actually has to be applied differently?


    With capacitors, the lifespan is measured at the maximum rated temperature, which in the case of these capacitors is 105 degrees Celsius. But as the temperature that the capacitors is exposed to drops, the lifetime increases, so for example, the lifespan of those capacitors at say 50 degrees might well be 75,000 hours
  • Kordanor
    I am not very familiar with PSU standards. What exactly is the second EPS connector used for? Is it only some X99 boards? Or are also some Z170 boards affected? Planned to get a Asus Z170 Pro Gaming but that one seems to be fine, if I am correct.

    Also I planned to potentially use 2 GTX 980 Phantom Cards - but if I am correct the Power supply wouldn't be able to support 2 cards, as one of these already requires 1X 8Pin and 1X 6Pin Connection.

    Can anyone tell me if I am correct, and give me a suggestion of an alternative, equally priced and silent PSU if possible?