Corsair SF Series 750 W Review 11

Corsair SF Series 750 W Review

Cross Load Tests »

Test Setup



Primary Rails Load Regulation

The following charts show the voltage values of the main rails, recorded over a range from 60 W to the maximum specified load, and the deviation (in percent) for the same load range. Tight load regulation is an important characteristic for power supplies since it allows for constant voltage levels despite changes in load.






5VSB Regulation



Hold-up Time

Hold-up time represents for how long, usually in milliseconds, a PSU can maintain output regulations as defined by the ATX specification without input power. Put simply, hold-up time is the amount of time the system can continue to run without shutting down or rebooting during a power interruption. In the following screenshots, the blue line is the mains signal, the green line the "Power Good" signal, and the yellow line the +12V rail.






Hold-up time is low. At least the power ok signal is accurate, though well below the 16 ms the ATX specification requires.

Inrush Current

Inrush current, or switch-on surge, refers to the maximum, instantaneous input current drawn by an electrical device when it is first turned on. Large enough inrush current can cause the tripping of circuit breakers and fuses and may also damage switches, relays, and bridge rectifiers. As a result, the lower the inrush current of a PSU right as it is turned on, the better.


With 230 V input, inrush current is quite high.

10-110% Load Testing

These tests reveal the SF750's load regulation and efficiency levels under high ambient temperatures. They also show how the fan-speed profile behaves under tough operating conditions.

Load Regulation & Efficiency Testing Data - Corsair SF750 Platinum
Test12 V5 V3.3 V5VSBPower
(DC/AC)
EfficiencyFan SpeedPSU NoiseTemp
(In/Out)
PF/AC
Volts
10% Load4.387A1.973A1.962A0.994A74.410W88.198%0 RPM<6.0 dB(A)39.72°C0.835
12.039V5.069V3.361V5.029V84.367W46.23°C230.20V
20% Load9.840A2.960A2.946A1.195A149.302W92.153%0 RPM<6.0 dB(A)40.82°C0.913
12.033V5.067V3.359V5.023V162.015W48.13°C230.20V
30% Load15.694A3.454A3.422A1.395A224.802W93.264%0 RPM<6.0 dB(A)41.33°C0.941
12.031V5.066V3.358V5.017V241.039W50.14°C230.20V
40% Load21.481A3.949A3.932A1.597A299.594W93.625%0 RPM<6.0 dB(A)41.85°C0.954
12.029V5.065V3.356V5.011V319.992W51.59°C230.20V
50% Load26.935A4.939A4.917A1.798A374.508W93.574%1363 RPM13.2 dB(A)42.15°C0.963
12.029V5.064V3.355V5.005V400.226W52.45°C230.20V
60% Load32.398A5.926A5.905A2.001A449.388W93.421%1510 RPM18.1 dB(A)42.63°C0.968
12.025V5.062V3.353V5.000V481.037W54.22°C230.20V
70% Load37.885A6.918A6.891A2.204A524.751W93.090%1855 RPM24.6 dB(A)43.24°C0.973
12.027V5.061V3.351V4.993V563.703W56.19°C230.20V
80% Load43.378A7.906A7.883A2.407A600.078W92.677%2545 RPM33.8 dB(A)43.84°C0.976
12.026V5.060V3.350V4.986V647.495W57.32°C230.20V
90% Load49.238A8.404A8.364A2.409A674.601W92.241%3120 RPM39.3 dB(A)44.58°C0.979
12.025V5.058V3.348V4.983V731.343W59.36°C230.21V
100% Load55.099A8.902A8.875A2.512A749.728W91.707%3684 RPM43.9 dB(A)45.63°C0.981
12.024V5.057V3.346V4.978V817.521W60.84°C230.19V
110% Load61.362A8.902A8.881A2.513A824.964W91.157%3885 RPM44.8 dB(A)46.61°C0.982
12.023V5.056V3.344V4.975V904.991W62.46°C230.20V
Crossload 10.142A16.003A15.999A0.000A136.570W87.009%1631 RPM21.1 dB(A)42.78°C0.911
12.042V5.066V3.362V5.032V156.961W52.39°C230.20V
Crossload 262.513A1.001A1.001A1.000A765.011W92.171%3537 RPM42.4 dB(A)45.91°C0.981
12.023V5.059V3.346V5.003V829.989W60.71°C230.20V


Light Load Testing

In the following tests, we measure the SF750's efficiency at loads significantly lower than 10 percent of its maximum capacity (the lowest load the 80 PLUS standard measures). This is representative of when a PC is idle with its power-saving features turned on.

Efficiency at Low Loads - Corsair SF750 Platinum
Test #12 V5 V3.3 V5 VSBPower
(DC/AC)
EfficiencyFan SpeedPSU NoisePF/AC
Volts
12.861A0.492A0.476A0.198A39.488W83.057%0 RPM<6.0 dB(A)0.727
12.023V5.068V3.359V5.041V47.543W230.20V
24.121A0.986A0.981A0.397A59.869W87.062%0 RPM<6.0 dB(A)0.806
12.030V5.068V3.359V5.038V68.766W230.19V
35.318A1.479A1.457A0.596A79.387W89.127%0 RPM<6.0 dB(A)0.844
12.034V5.068V3.359V5.034V89.072W230.20V
46.582A1.972A1.966A0.795A99.797W90.415%0 RPM<6.0 dB(A)0.876
12.033V5.067V3.359V5.031V110.377W230.20V

Efficiency

Using the results we gathered so far, we plotted a chart showing the SF750's efficiency at low loads and loads ranging from 10 to 110 percent of its maximum-rated capacity.

This is a very efficient platform under both light and normal loads.

5VSB Efficiency

5VSB Efficiency - Corsair SF750 Platinum
Test #5VSBPower (DC/AC)EfficiencyPF/AC Volts
10.100A0.505W65.755%0.033
5.044V0.768W230.21V
20.250A1.261W74.133%0.071
5.042V1.701W230.20V
30.550A2.772W82.746%0.132
5.038V3.350W230.20V
41.000A5.033W84.277%0.208
5.032V5.972W230.21V
51.500A7.540W83.974%0.269
5.026V8.979W230.21V
62.500A12.534W84.047%0.338
5.013V14.913W230.21V
This is one of the most efficient 5VSB rails we have seen so far.

Power Consumption in Idle and Standby

Idle / Standby - Corsair SF750 Platinum
Mode12 V5 V3.3 V5VSBPower (AC)PF/AC Volts
Idle12.032V5.066V3.358V5.046V4.812W0.176
230.2V
Standby0.075W0.003
230.2V

Fan RPM, Delta Temperature and Output Noise

The following results were obtained at 37–47 °C ambient.





The following results were obtained at 30–32 °C ambient.



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