Lian Li SP750 750 W SFX PSU Review

Name: Lian Li SP750 750 W SFX PSU
Brand: Lian Li
Price: 140 USD

crmaris

on Jul 2nd, 2021,

in Power Supplies.

Manufacturer: Lian Li

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
Test	12 V	5 V	3.3 V	5VSB	Power (DC/AC)	Efficiency	Fan Speed	PSU Noise	Temp (In/Out)	PF/AC Volts
10% Load	4.409A	1.954A	1.963A	0.984A	74.952W	85.784%	2010 RPM	34.0 dB(A)	40.66°C	0.815
10% Load	12.100V	5.118V	3.363V	5.081V	87.373W	85.784%	2010 RPM	34.0 dB(A)	43.60°C	230.34V
20% Load	9.841A	2.935A	2.952A	1.185A	149.996W	91.162%	2002 RPM	34.1 dB(A)	40.77°C	0.914
20% Load	12.102V	5.110V	3.355V	5.062V	164.537W	91.162%	2002 RPM	34.1 dB(A)	44.18°C	230.33V
30% Load	15.624A	3.430A	3.448A	1.388A	224.989W	92.299%	2145 RPM	35.7 dB(A)	41.06°C	0.946
30% Load	12.093V	5.103V	3.348V	5.044V	243.762W	92.299%	2145 RPM	35.7 dB(A)	45.11°C	230.32V
40% Load	21.415A	3.925A	3.951A	1.592A	299.979W	92.733%	2228 RPM	35.9 dB(A)	41.52°C	0.961
40% Load	12.084V	5.096V	3.340V	5.026V	323.487W	92.733%	2228 RPM	35.9 dB(A)	46.32°C	230.32V
50% Load	26.816A	4.918A	4.952A	1.798A	374.324W	92.667%	2462 RPM	40.5 dB(A)	42.65°C	0.970
50% Load	12.075V	5.087V	3.332V	5.007V	403.945W	92.667%	2462 RPM	40.5 dB(A)	48.24°C	230.31V
60% Load	32.279A	5.908A	5.956A	2.000A	449.225W	92.475%	2679 RPM	40.8 dB(A)	42.79°C	0.974
60% Load	12.065V	5.079V	3.324V	4.987V	485.781W	92.475%	2679 RPM	40.8 dB(A)	49.48°C	230.31V
70% Load	37.783A	6.905A	6.967A	2.214A	524.575W	92.190%	2869 RPM	44.3 dB(A)	43.24°C	0.978
70% Load	12.055V	5.070V	3.315V	4.967V	569.012W	92.190%	2869 RPM	44.3 dB(A)	50.79°C	230.31V
80% Load	43.291A	7.905A	7.981A	2.425A	599.880W	91.751%	2983 RPM	45.2 dB(A)	43.94°C	0.981
80% Load	12.046V	5.061V	3.307V	4.947V	653.816W	91.751%	2983 RPM	45.2 dB(A)	51.86°C	230.30V
90% Load	49.179A	8.409A	8.487A	2.429A	674.415W	91.342%	2983 RPM	45.2 dB(A)	44.19°C	0.983
90% Load	12.036V	5.054V	3.299V	4.940V	738.343W	91.342%	2983 RPM	45.2 dB(A)	52.90°C	230.31V
100% Load	55.072A	8.917A	9.020A	2.537A	749.538W	90.893%	2987 RPM	45.2 dB(A)	45.52°C	0.984
100% Load	12.027V	5.046V	3.292V	4.926V	824.634W	90.893%	2987 RPM	45.2 dB(A)	54.83°C	230.31V
110% Load	61.365A	8.929A	9.037A	2.540A	824.723W	90.509%	3000 RPM	45.5 dB(A)	46.17°C	0.985
110% Load	12.019V	5.039V	3.285V	4.920V	911.206W	90.509%	3000 RPM	45.5 dB(A)	55.85°C	230.30V
Crossload 1	0.116A	11.998A	11.998A	0.000A	102.629W	85.962%	2570 RPM	40.9 dB(A)	42.55°C	0.874
Crossload 1	12.091V	5.096V	3.341V	5.126V	119.389W	85.962%	2570 RPM	40.9 dB(A)	48.18°C	230.31V
Crossload 2	61.994A	1.000A	1.001A	1.000A	759.564W	91.454%	2999 RPM	45.5 dB(A)	45.40°C	0.984
Crossload 2	12.036V	5.064V	3.308V	5.028V	830.541W	91.454%	2999 RPM	45.5 dB(A)	54.50°C	230.31V

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 V	5 V	3.3 V	5 VSB	Power (DC/AC)	Efficiency	Fan Speed	PSU Noise	PF/AC Volts
1	1.225A	0.488A	0.490A	0.195A	19.985W	63.622%	1750 RPM	30.1 dB(A)	0.521
1	12.108V	5.126V	3.370V	5.132V	31.412W	63.622%	1750 RPM	30.1 dB(A)	230.32V
2	2.452A	0.975A	0.979A	0.391A	39.976W	78.915%	1769 RPM	30.3 dB(A)	0.668
2	12.105V	5.123V	3.368V	5.119V	50.657W	78.915%	1769 RPM	30.3 dB(A)	230.37V
3	3.682A	1.464A	1.469A	0.588A	60.005W	83.572%	1890 RPM	31.7 dB(A)	0.768
3	12.103V	5.120V	3.365V	5.106V	71.800W	83.572%	1890 RPM	31.7 dB(A)	230.36V
4	4.906A	1.953A	1.963A	0.785A	79.953W	86.787%	1913 RPM	32.3 dB(A)	0.826
4	12.100V	5.117V	3.362V	5.092V	92.126W	86.787%	1913 RPM	32.3 dB(A)	230.34V

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 V	5 V	3.3 V	5 VSB	Power (DC/AC)	Efficiency	Fan Speed	PSU Noise	PF/AC Volts
1	1.087A	0.212A	0.210A	0.044A	15.195W	69.159%	1679 RPM	28.1 dB(A)	0.742
1	12.119V	5.127V	3.371V	5.142V	21.971W	69.159%	1679 RPM	28.1 dB(A)	115.15V

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

5VSB Efficiency

5VSB Efficiency - Lian Li SP750
Test #	5VSB	Power (DC/AC)	Efficiency	PF/AC Volts
1	0.100A	0.514W	70.604%	0.035
1	5.139V	0.728W	70.604%	230.26V
2	0.250A	1.282W	78.506%	0.074
2	5.130V	1.633W	78.506%	230.26V
3	0.550A	2.811W	82.217%	0.138
3	5.113V	3.419W	82.217%	230.26V
4	1.000A	5.087W	83.230%	0.200
4	5.088V	6.112W	83.230%	230.26V
5	1.500A	7.588W	82.793%	0.240
5	5.059V	9.165W	82.793%	230.27V
6	2.499A	12.498W	82.072%	0.280
6	5.001V	15.228W	82.072%	230.27V

The 5VSB rail is highly efficient.

Power Consumption in Idle and Standby

Idle / Standby - Lian Li SP750
Mode	12 V	5 V	3.3 V	5VSB	Power (AC)	PF/AC Volts
Idle	12.111V	5.128V	3.373V	5.146V	4.688W	0.147
Idle	12.111V	5.128V	3.373V	5.146V	4.688W	230.3V
Standby					0.086W	0.004
Standby					0.086W	230.3V

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

Oct 4th, 2024 03:17 EDT change timezone

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