Lian Li Silent Force 850W Review

paulktreg - December 8, 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	1	0.34	N/A	N/A
177	222	0.95	80	Pass
466	557	0.98	84	Pass
860	1097	1.00	78	Pass

Output & Efficiency at 230VAC
DC Load (W)	AC Load (W)	PF	Efficiency (%)	Pass/Fail
0	9	0.32	N/A	N/A
177	217	0.82	82	Pass
462	543	0.91	85	Pass
864	1050	0.94	82	Pass

One thing I have noticed throughout testing power supplies is best power factor at 110VAC, and best efficiency at 230VAC, which is once again the case with the Lian Li Silent Force 850W. The measurements however, do not meet the requirements of the stated 80 Plus certification. The efficiency drops below 80% at 110VAC and the power factor drops below 0.9 at 230VAC. I have however, technically speaking, subjected the power supply to a minor overload, but I feel dropping the load to exactly 850W would of made little or no difference to the efficiency or power factor measurements.

The Lian Li Silent Force 850W does meet the requirements of the ATX12V V2.2 specification and therefore, despite some minor failures against its quoted specification, still gains a pass in this section.

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.