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

Efficiency »

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 essential characteristic for every power supply because it allows for constant voltage levels despite changes in load.

5VSB Regulation

Load regulation is tight at +12 V, decent at 5 V, not so tight at 3.3 V, and loose at 5VSB.

Ripple Measurements

Ripple represents the AC fluctuations (periodic) and noise (random) found in the DC rails of PSUs. Ripple significantly decreases the life span of capacitors because it increases their temperature; a 10 °C increase can cut into a capacitor's life span by up to 50 percent. Ripple also plays an important role in overall system stability, especially when it is overclocked. The ripple limits according to the ATX specification are 120 mV (+12V) and 50 mV (+5V, +3.3V, and 5VSB).

Ripple Measurements - Lian Li SP750
Test	12 V	5 V	3.3 V	5VSB	Pass/Fail
10% Load	6.5 mV	11.6 mV	5.9 mV	7.8 mV	Pass
20% Load	12.7 mV	11.9 mV	6.2 mV	7.9 mV	Pass
30% Load	12.4 mV	12.5 mV	7.0 mV	8.5 mV	Pass
40% Load	14.0 mV	13.0 mV	7.3 mV	8.9 mV	Pass
50% Load	15.6 mV	13.2 mV	7.7 mV	9.8 mV	Pass
60% Load	16.7 mV	13.7 mV	7.8 mV	10.3 mV	Pass
70% Load	18.1 mV	14.0 mV	8.2 mV	10.8 mV	Pass
80% Load	19.7 mV	15.7 mV	9.9 mV	12.3 mV	Pass
90% Load	21.5 mV	15.7 mV	9.8 mV	12.1 mV	Pass
100% Load	29.6 mV	17.0 mV	10.4 mV	15.4 mV	Pass
110% Load	31.7 mV	17.2 mV	11.1 mV	14.9 mV	Pass
Crossload 1	19.1 mV	20.0 mV	13.0 mV	19.1 mV	Pass
Crossload 2	29.6 mV	14.8 mV	9.5 mV	11.4 mV	Pass

Ripple suppression is good on all rails. You cannot install many filtering capacitors in these compact PSUs, so do not expect the same ripple levels as with high-end ATX PSUs at 12 V.