SilverStone Strider Platinum 750W Power Supply Review

Transient Response Tests

Advanced Transient Response Tests

For details on our transient response testing, please click here.

In these tests, we monitor the response of the PSU in two different scenarios. First, a transient load (10A at +12V, 5A at 5V, 5A at 3.3V and 0.5A at 5VSB) is applied for 200ms while the PSU works at 20 percent load. In the second scenario, the PSU is hit by the same transient load while operating at 50 percent load. In both tests, we use our oscilloscope to measure the voltage drops caused by the transient load. The voltages should remain within the ATX specification's regulation limits.

These tests are crucial because they simulate the transient loads a PSU is likely to handle (such as booting a RAID array or an instant 100 percent load of CPU/GPUs). We call them "Advanced Transient Response Tests," and they are designed to be very tough to master, especially for PSUs with less than 500W capacity.   

Advanced Transient Response at 20 Percent

VoltageBeforeAfterChangePass/Fail
12V12.148V12.001V1.21%Pass
5V5.051V4.952V1.96%Pass
3.3V3.347V3.196V4.51%Pass
5VSB5.026V4.959V1.33%Pass

Advanced Transient Response at 50 Percent

VoltageBeforeAfterChangePass/Fail
12V12.079V11.934V1.20%Pass
5V5.001V4.909V1.84%Pass
3.3V3.308V3.145V4.93%Pass
5VSB4.969V4.913V1.13%Pass

The deviations on the +12V rail are higher than we would like to see; the same applies to the 3.3V rail, which dropped below 3.2V in both tests. Only the 5V and 5VSB rails managed to register good enough performance.

Here are the oscilloscope screenshots we took during Advanced Transient Response Testing:

Transient Response At 20 Percent Load

Transient Response At 50 Percent Load

Turn-On Transient Tests

In the next set of tests, we measure the PSU's response in simpler transient load scenarios—during its power-on phase.

For the first measurement, we turn off the PSU, dial in the maximum current the 5VSB can output and switch on the PSU. In the second test, we dial the maximum load the +12V can handle and start the PSU while it's in standby mode. In the last test, while the PSU is completely switched off (we cut off the power or switch off the PSU by flipping its on/off switch), we dial the maximum load the +12V rail can handle before switching on the PSU from the loader and restoring power. The ATX specification states that recorded spikes on all rails should not exceed 10 percent of their nominal values (+10 percent for 12V is 13.2V, and 5.5V for 5V).

The 5VSB slope isn't exactly smooth; however, there are no spikes or voltage overshoots. Things look better in the second test, although the rail needs some time until it reaches the nominal voltage. Finally, in the third test, we notice two small periods with excess ripple. Most likely the primary switching FETs have a hard time catching up with the sudden transition to full load operation from power-off mode.

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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?