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Antec Signature 850W Review

paulktreg    -   September 18, 2008
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Testing (Continued):

Efficiency and Power Factor:

 

 

 

 

 

 

 

 

 

 

Output & Efficiency at 110VAC
DC Load (W)
AC Load (VA)
AC Load (W)
PF
Efficiency (%)
Pass/Fail
0
10
0
0.02
N/A
N/A
172
210
210
1.0
82
Pass
472
568
570
1.0
83
Pass
809
1035
1036
1.0
78
Pass

 

Output & Efficiency at 240VAC
DC Load (W)
AC Load (VA)
AC Load (W)
PF
Efficiency (%)
Pass/Fail
0
43
1
0.03
N/A
N/A
172
219
206
0.94
83
Pass
472
557
555
0.99
85
Pass
811
1001
997
0.99
81
Pass

 

The 80 PLUS Bronze certification requires the Antec Signature 850W to run at greater than or equal to 82-85-82 percent efficiency at 20-50-100 percent of rated power output. While the specification has been partially met, I think I can allow a pass at 240VAC, there is a failure as you see can above at 110VAC. The power supply did, however, meet the ATX12V minimum required efficiency, and I have therefore given the power supply an overall pass in this section.

The 80 PLUS certification also requires the power supply to maintain a power factor PF of 0.9 or better, no problems here.

These are some of the best efficiency figures I have seen so far and go some way in explaining the use of a smaller 80mm cooling fan. High efficiency = less heat.

 

AC Ripple on DC Outputs:

 

All AC ripple measurements are made at the maximum load, and were found to be virtually identical for 110VAC and 240VAC input. I have therefore included oscilloscope screenshots for 240VAC only.

 

AC ripple on 3V3 rail.

AC ripple on 5V0 rail.

AC ripple on 12V rail.

 

Antec Signature 850W AC Ripple/Noise Measurements

DC Output
3V3
5V0
12V1
12V2
12V3
12V4
-12V
5VSB
Ripple (mV p-p)
8
10
13
13
13
13
20
10
Pass/Fail
Pass
Pass
Pass
Pass
Pass
Pass
Pass
Pass

 

Impressive figures! These really are very low and will be hard to equal, let alone improve.

Onward...




  1. Introduction & Closer Look
  2. Closer Look (The Power Supply)
  3. Specifications & Features
  4. Testing: Load Testing at 110VAC & 230VAC
  5. Testing: Efficiency & Power Factor
  6. Testing: Temperature, Noise Levels & Fan Speeds
  7. Conclusion
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