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Lian-Li Silent Force 750W Review

paulktreg    -   October 7, 2008
» Discuss this article (5)

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

 

No problems. The Lian-Li Silent Force 750W produces very clean rails with ripple/noise levels well below the maximum permissable levels.

 




  1. Introduction & Closer Look
  2. Closer Look (The Power Supply)
  3. Specification & Features
  4. Testing: DC Voltage Load Regulation At 110VAC & 230VAC
  5. Testing: Efficiency, Power Factor & DC Quality
  6. Testing: Temperature, Noise Level & Fan Speed
  7. Conclusion
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