SilentiumPC Supremo M1 700 W Review 7

SilentiumPC Supremo M1 700 W Review

Cross Load Tests »

Efficiency

Using the efficiency results from the previous page, we plotted a chart that shows the Supremo M1-700's efficiency at low loads and at loads equal to 20%-110% of the PSU's maximum-rated load.



Managing to take the top spot in our chart of similarly powerful units, the Supremo M1-700 excelled in terms of efficiency at low loads. You should buy this PSU if efficiency is your top priority.

Efficiency at Low Loads

We measured the efficiency of the Supremo M1-700 at loads much lower than 20% of its maximum-rated load (the lowest load the 80 Plus Standard measures) in the following tests. The loads we dialed were 40 W, 60 W, 80 W, and 100 W (for PSUs with a capactiy over 500 W). This is important for settings where the PC is in idle mode with Power Saving turned on.

Efficiency at Low Loads - SilentiumPC Supremo M1-700
Test #12 V5 V3.3 V5 VSBPower
(DC/AC)
EfficiencyFan SpeedFan NoisePF/AC
Volts
11.787A1.972A1.968A0.190A39.72W83.90%0 RPM0 dBA0.612
12.393V5.071V3.351V5.144V47.34W230.5V
23.323A1.972A1.969A0.385A59.74W88.86%0 RPM0 dBA0.701
12.390V5.070V3.350V5.138V67.23W230.4V
34.861A1.971A1.969A0.579A79.76W90.86%0 RPM0 dBA0.765
12.385V5.069V3.349V5.134V87.78W230.3V
46.395A1.972A1.969A0.780A99.76W91.82%0 RPM0 dBA0.810
12.381V5.069V3.348V5.127V108.65W230.3V
Efficiency with low loads is outstanding! This PSU easily cracked the 80% mark with 40 W load and scored close to 92% efficiency with 100 W load!

5VSB Efficiency

The ATX specification 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 - SilentiumPC Supremo M1-700
Test #5VSBPower (DC/AC)EfficiencyPF/AC Volts
10.102A0.53W63.86%0.030
5.152V0.83W231.8V
20.252A1.30W68.06%0.067
5.147V1.91W230.7V
31.002A5.14W73.22%0.205
5.126V7.02W231.8V
43.002A15.27W75.41%0.336
5.085V20.25W230.9V
We expected more from its 5VSB rail. It definitely doesn't perform as well as any of the other rails, which is a shame.

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 - SilentiumPC Supremo M1-700
Mode12 V5 V3.3 V5VSBPower (AC)PF/AC Volts
Idle12.397V5.079V3.362V5.154V5.09W0.161
231.5V
Standby0.23W0.004
230.9V
Phantom power was pretty low.

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-46°C ambient.



A chart that shows the cooling fan's speed (RPMs) and the output noise follows. We measure the fan's noise from 1 meter away, 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 temperature was between 28°C and 30°C.



The Supremo features a silent overall operation. Fanless mode may not last for long, but the fan is silent once it engages. As you can see in the above graph, the fan produces more noise at high loads than at full load, which is due to vibrations at those speeds since its RPM is at its highest at full load.
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Jul 24th, 2024 15:21 EDT change timezone

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