Lian Li SP750 750 W SFX PSU Review 7

Lian Li SP750 750 W SFX PSU Review

Fan Noise »

Efficiency

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




This is an efficient platform, especially with normal and super-light loads.

10%–110% Load Testing

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

Load Regulation & Efficiency Testing Data - Lian Li SP750
Test12 V5 V3.3 V5VSBPower
(DC/AC)
EfficiencyFan SpeedPSU NoiseTemp
(In/Out)
PF/AC
Volts
10% Load4.409A1.954A1.963A0.984A74.952W85.784%2010 RPM34.0 dB(A)40.66°C0.815
12.100V5.118V3.363V5.081V87.373W43.60°C230.34V
20% Load9.841A2.935A2.952A1.185A149.996W91.162%2002 RPM34.1 dB(A)40.77°C0.914
12.102V5.110V3.355V5.062V164.537W44.18°C230.33V
30% Load15.624A3.430A3.448A1.388A224.989W92.299%2145 RPM35.7 dB(A)41.06°C0.946
12.093V5.103V3.348V5.044V243.762W45.11°C230.32V
40% Load21.415A3.925A3.951A1.592A299.979W92.733%2228 RPM35.9 dB(A)41.52°C0.961
12.084V5.096V3.340V5.026V323.487W46.32°C230.32V
50% Load26.816A4.918A4.952A1.798A374.324W92.667%2462 RPM40.5 dB(A)42.65°C0.970
12.075V5.087V3.332V5.007V403.945W48.24°C230.31V
60% Load32.279A5.908A5.956A2.000A449.225W92.475%2679 RPM40.8 dB(A)42.79°C0.974
12.065V5.079V3.324V4.987V485.781W49.48°C230.31V
70% Load37.783A6.905A6.967A2.214A524.575W92.190%2869 RPM44.3 dB(A)43.24°C0.978
12.055V5.070V3.315V4.967V569.012W50.79°C230.31V
80% Load43.291A7.905A7.981A2.425A599.880W91.751%2983 RPM45.2 dB(A)43.94°C0.981
12.046V5.061V3.307V4.947V653.816W51.86°C230.30V
90% Load49.179A8.409A8.487A2.429A674.415W91.342%2983 RPM45.2 dB(A)44.19°C0.983
12.036V5.054V3.299V4.940V738.343W52.90°C230.31V
100% Load55.072A8.917A9.020A2.537A749.538W90.893%2987 RPM45.2 dB(A)45.52°C0.984
12.027V5.046V3.292V4.926V824.634W54.83°C230.31V
110% Load61.365A8.929A9.037A2.540A824.723W90.509%3000 RPM45.5 dB(A)46.17°C0.985
12.019V5.039V3.285V4.920V911.206W55.85°C230.30V
Crossload 10.116A11.998A11.998A0.000A102.629W85.962%2570 RPM40.9 dB(A)42.55°C0.874
12.091V5.096V3.341V5.126V119.389W48.18°C230.31V
Crossload 261.994A1.000A1.001A1.000A759.564W91.454%2999 RPM45.5 dB(A)45.40°C0.984
12.036V5.064V3.308V5.028V830.541W54.50°C230.31V

The PSU was able to deliver its full power and even more at temperatures exceeding 45°C. If you plan to push this PSU that hard, you had better wear earplugs since the fan's noise exceeds 45 dBA.

Light Load Testing

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

Efficiency at Low Loads - Lian Li SP750
Test #12 V5 V3.3 V5 VSBPower
(DC/AC)
EfficiencyFan SpeedPSU NoisePF/AC
Volts
11.225A0.488A0.490A0.195A19.985W63.622%1750 RPM30.1 dB(A)0.521
12.108V5.126V3.370V5.132V31.412W230.32V
22.452A0.975A0.979A0.391A39.976W78.915%1769 RPM30.3 dB(A)0.668
12.105V5.123V3.368V5.119V50.657W230.37V
33.682A1.464A1.469A0.588A60.005W83.572%1890 RPM31.7 dB(A)0.768
12.103V5.120V3.365V5.106V71.800W230.36V
44.906A1.953A1.963A0.785A79.953W86.787%1913 RPM32.3 dB(A)0.826
12.100V5.117V3.362V5.092V92.126W230.34V

Efficiency levels are high enough at light loads, but the same also goes for the fan's noise.

Ultra-Light Load Testing

The applied load in this test is only 10 W for PSUs with 500 W and less capacity. This is because we dial in 2% of the maximum-rated capacity for all other PSUs and only run this test with 115 V input.

Efficiency at Low Loads - Lian Li SP750
Test #12 V5 V3.3 V5 VSBPower
(DC/AC)
EfficiencyFan SpeedPSU NoisePF/AC
Volts
11.087A0.212A0.210A0.044A15.195W69.159%1679 RPM28.1 dB(A)0.742
12.119V5.127V3.371V5.142V21.971W115.15V

The PSU is very close to the 70% mark with 2% load.

5VSB Efficiency

5VSB Efficiency - Lian Li SP750
Test #5VSBPower (DC/AC)EfficiencyPF/AC Volts
10.100A0.514W70.604%0.035
5.139V0.728W230.26V
20.250A1.282W78.506%0.074
5.130V1.633W230.26V
30.550A2.811W82.217%0.138
5.113V3.419W230.26V
41.000A5.087W83.230%0.200
5.088V6.112W230.26V
51.500A7.588W82.793%0.240
5.059V9.165W230.27V
62.499A12.498W82.072%0.280
5.001V15.228W230.27V


The 5VSB rail is highly efficient.

Power Consumption in Idle and Standby

Idle / Standby - Lian Li SP750
Mode12 V5 V3.3 V5VSBPower (AC)PF/AC Volts
Idle12.111V5.128V3.373V5.146V4.688W0.147
230.3V
Standby0.086W0.004
230.3V


Power consumption is quite high in standby and 230 V input.
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