Lian-Li Silent Force 750W Review

paulktreg - October 7, 2008
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Testing (Continued):

Efficiency and Power Factor:

Output & Efficiency at 110VAC
DC Load (W)	AC Load (W)	PF	Efficiency (%)	Pass/Fail
0	7	0.56	N/A	N/A
176	222	0.95	79	Pass
476	596	0.98	80	Pass
748	976	1.00	77	Pass

Output & Efficiency at 240VAC
DC Load (W)	AC Load (W)	PF	Efficiency (%)	Pass/Fail
0	2	0.18	N/A	N/A
176	218	0.84	81	Pass
477	573	0.91	83	Pass
748	950	0.94	79	Pass

The efficiency of the Lian-Li Silent Force 750W, although very good, did not quite meet the requirements of the 80 Plus certification. I think I can allow one or two percent either way (my test equipment does after all have some measurement inaccuracies in the order of a few percent), but feel I must give a fail (for 80 Plus) at 748W on 110VAC. It is very close and if I was to test another Silent Force 750W, it could very well pass. The power supply did however meet the recommended efficiency ratings of the ATX12V specification and gets an overall pass in this section.

Power factor must be maintained at greater than 0.9 for 80 Plus certification and as you can see we have a low value of 0.84 at 176W on 240VAC. I must give the power supply a definate fail for this minor discrepancy.

AC Ripple On DC Outputs:

Ripple/noise levels at 110VAC and 230VAC are virtually identical (slightly lower at 110VAC if anything, which is to be expected) and I have therefore included screenshots and values for 230VAC only.

AC Noise/Ripple on 3V3 rail.

AC Noise/Ripple on 5V0 rail.

AC Noise/Ripple on 12V rail.

Lian-Li Silent Force 750W AC Ripple/Noise Measurements
DC Output	3V3	5V0	12V1	12V2	12V3	12V4	-12V	5VSB
Ripple (mV p-p)	8	14	32	32	32	32	42	15
Pass/Fail	Pass	Pass	Pass	Pass	Pass	Pass	Pass	Pass