SilverStone Strider Platinum 750W Power Supply Review

Efficiency, Temperature And Noise

Efficiency

Our efficiency testing procedure is detailed here.

Using the results from the previous page, we plotted a chart showing the ST75F-PT's efficiency at low loads, and loads from 10 to 110 percent of its maximum-rated capacity.

The efficiency difference between 115V and 230V input is notable, and it increases significantly at higher loads. This is natural, of course, since amperage is reduced at 230V, cutting power losses. Compared to high-performance 750W Gold-rated PSUs we've tested, the ST75F-PT easily takes the lead. But it can't match Seasonic's Snow Silent, which is based on a top-notch Platinum-rated platform.

Efficiency At Low Loads

In the following tests, we determine the ST75F-PT's efficiency at loads significantly lower than 10 percent of its maximum capacity (the lowest load the 80 PLUS standard measures). The loads we dialed were 20, 40, 60 and 80W. This is important for representing when a PC is idle, with power-saving features turned on.

Test #12V5V3.3V5VSBDC/AC (Watts)EfficiencyFan Speed (RPM)Fan Noise (dBA)PF/AC Volts
11.196A0.491A0.472A0.196A19.6770.35%00 dB(A)0.906
12.192V5.090V3.372V5.084V27.96115.0V
22.421A0.978A0.977A0.390A39.7381.40%00 dB(A)0.953
12.182V5.083V3.369V5.073V48.81115.1V
33.646A1.465A1.484A5.062A59.8186.05%00 dB(A)0.970
12.175V5.076V3.365V5.062V69.51115.1V
44.865A1.972A1.960A0.790A79.7887.83%00 dB(A)0.973
12.169V5.069V3.361V5.052V90.83115.1V

Under light loads, the PSU operates in passive mode with high efficiency. We are pleased to see that, even subjected to a 20W load, it scores above 70 percent. In the rest of the tests, it easily exceeds 80 percent.

5VSB Efficiency

The ATX specification states that 5VSB standby supply efficiency should be as high as possible, recommending 50 percent or higher efficiency with 100mA of load, 60 percent or higher with 250mA of load and 70 percent or higher with 1A or more of load.

We take four measurements: one each at 100, 250 and 1000mA, and one with the full load the 5VSB rail can handle. 

Test #5VSBDC/AC (Watts)EfficiencyPF/AC Volts
10.102A0.5274.29%0.097
5.108V0.70115.1V
20.252A1.2978.66%0.189
5.101V1.64115.1V
31.002A5.0882.33%0.317
5.071V6.17115.1V
43.002A14.9679.53%0.378
4.984V18.81115.1V

The 5VSB rail registers high efficiency, even in the first two tests. Sirfa does a good job here.

Power Consumption In Idle And Standby

Mode12V5V3.3V5VSBWattsPF/AC Volts
Idle12.336V5.096V3.376V5.094V8.270.615
115.1V
Standby0.080.012
115.1V

In the table above, you'll find the power consumption and voltage values of all rails except -12V when the PSU is idle (powered on, but without any load on its rails), and the power consumption when the PSU is in standby mode (without any load, at 5VSB).

Phantom power is well below 0.5W with both 115V and 230V input.

Fan RPM, Delta Temperature And Output Noise

Our mixed noise testing is described in detail here.

The first chart below illustrates the cooling fan's speed (RPMs), and the delta between input and output temperature. The results were obtained at 33 °C (91.4 °F) to 48 °C (118.4 °F) ambient temperature.   

The next chart shows the cooling fan's speed (RPMs) and output noise. We measured acoustics from one meter away, inside a small, custom-made anechoic chamber with internals completely covered in sound-proofing material (be quiet! Noise Absorber kit). Background noise inside the chamber was below 18 dB(A) during testing, and the results were obtained with the PSU operating at 33 °C (91.4 °F) to 48 °C (118.4 °F) ambient temperature. 

The following graph illustrates the fan's output noise over the entire operating range of the PSU. The same conditions of the above graph apply to our measurements, though the ambient temperature was between at 28 °C (82.4 °F) to 30 °C (86 °F).  

If you keep the operating temperature at normal levels, you will enjoy a quiet experience. At up to 460W, the ST75F-PT operates in passive mode, and after that its fan spins slowly.

Create a new thread in the UK Article comments forum about this subject
This thread is closed for comments
3 comments
Comment from the forums
    Your comment
  • 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?