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Silverstone Strider Gold S Series 750 W Review 0

Silverstone Strider Gold S Series 750 W Review

Cross Load Tests »

Efficiency

Using the efficiency results from the previous page, we plotted a chart showing efficiency of the ST75F-GS at low loads and at loads equal to 20%-110% of the PSU's maximum-rated load.



Average efficiency was above the 80% mark at low loads, but 80% wasn't good enough for a topnotch position in our corresponding chart, among units with a similar capacity. The unit performed better at normal loads, but only managed to place ahead of EVGA's mid-level Gold unit. The ACRF topology obviously cannot keep up with the topologies of the other units in terms of efficiency.

Efficiency at Low Loads

In the next tests, we measured the efficiency of the ST75F-GS at loads much lower than 20% of its maximum rated load (the lowest load that the 80 Plus Standard measures). The loads we dialed were 40 W, 60 W, 80 W, and 100 W (for PSUs with a capacity over 500 W). This is important for settings where the PC is in idle mode with Power Saving turned on.

Efficiency at Low Loads - Silverstone ST75F-GS
Test #12 V5 V3.3 V5 VSBPower
(DC/AC)
EfficiencyFan SpeedFan NoisePF/AC
Volts
11.820A1.967A1.959A0.194A39.75W73.65%725 RPM33.1 dBA0.599
12.194V5.076V3.366V5.042V53.97W230.2V
23.378A1.970A1.959A0.395A59.75W79.36%725 RPM33.1 dBA0.695
12.189V5.073V3.363V5.034V75.29W230.2V
34.938A1.972A1.960A0.596A79.75W83.02%725 RPM33.1 dBA0.757
12.184V5.073V3.361V5.025V96.06W230.2V
46.501A1.972A1.963A0.795A99.75W85.38%725 RPM33.1 dBA0.797
12.178V5.070V3.360V5.015V116.83W230.1V
Below 75% at 40 W load, efficiency isn't bad at such low loads, but it isn’t high either, only cracking the 80% mark in the 80 W load test. Fan speed also remained at 33 dBA in all tests, which is very low.

5VSB Efficiency

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

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

5VSB Efficiency - Silverstone ST75F-GS
Test #5VSBPower (DC/AC)EfficiencyPF/AC Volts
10.101A0.51W60.00%0.015
5.055V0.85W230.9V
20.252A1.27W68.28%0.033
5.051V1.86W230.9V
31.002A5.04W76.95%0.110
5.025V6.55W230.9V
43.502A17.30W77.44%0.281
4.941V22.34W230.7V
The 5VSB rail performed decently, but we would like to see close to or even higher than 80% efficiency in one of the last two tests. The positive here is the rail's increased power compared to that of most other 750 W PSUs on the market. We are sick of high-end PSUs with only 2.5 maximum current amperage on this rail. Come on, give this rail more power - today's tablets and many other components are incredibly power hungry.

Power Consumption in Idle & Standby

In the table below, you will find the power consumption and the voltage values of all rails (except -12V) when the PSU is in idle mode (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).

Idle / Standby - Silverstone ST75F-GS
Mode12 V5 V3.3 V5VSBPower (AC)PF/AC Volts
Idle12.203V5.091V3.374V5.057V15.33W0.241
230.7V
Standby0.25W0.004
230.8V
Phantom power was very low and exactly in the middle of the limit the ErP Lot 6 2013 directive set.

Fan RPM, Delta Temperature & Output Noise

The cooling fan's speed (RPMs) and the delta difference between input and output temperature are illustrated in the following chart. The following results were obtained at 38°C-45°C ambient.



A chart that shows the cooling fan's speed (RPMs) and the output noise follows. We take our fan-noise measurement at a distance of 1 meter, inside a small custom-made anechoic chamber whose internals are completely covered in specialized soundproofing material (Be Quiet! Noise Absorber Kit). Background noise inside the anechoic chamber was below 30 dBA during testing, and the results were obtained with the PSU operating at 38°C-45°C ambient.



The following graph illustrates the fan's output noise throughout the entire operating range of the PSU. The same conditions of the above graph apply to our measurements, but the ambient was in this case between 28°C and 30°C.



Under normal conditions, the PSU is quite enough at up to about 500 W, but fan speed increases significantly afterward to move hot air out of the unit's internals, which has output noise increase to as much as 50 dBA.
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