Result Analysis and Discussion
Efficiency
|
| Load |
Pin(W) |
Pout(W) |
Efficiency |
| 10 % |
107.70 |
87.75 |
81.47 % |
| 20 % |
202.20 |
175.03 |
86.56 % |
| 50 % |
494.60 |
435.13 |
87.98 % |
| 100 % |
1028.80 |
865.46 |
84.12 % |
The 80Plus
Bronze certification
requirements (81% - 85% - 81%) are surpassed especially at 20% Load. The full Load
efficiency is a bit higher at 230V AC. This is the case with most of todays PSU's an it mainly
originates from the reason of lower losses in the AC filtering stage and the PFC at
230V AC.
Output Stability |
| Load |
Rail |
Loading(A) |
Output(V) |
|
10 % |
3.3V |
1.5 |
3.4 |
| 5V |
1.5 |
5.2 |
| 12V |
5.9 |
12.3 |
|
|
| 20 % |
3.3V |
3.0 |
3.4 |
| 5V |
3.0 |
5.2 |
| 12V |
11.9 |
12.3 |
|
|
| 50
% |
3.3V |
7.5 |
3.3 |
| 5V |
7.5 |
5.1 |
| 12V |
29.6 |
12.3 |
|
|
| 100 % |
3.3V |
15 |
3.3 |
| 5V |
15 |
5.1 |
| 12V |
59.1 |
12.3 |
The Voltage Regulation of
this PSU is very good. It makes use of a DC-DC topology. This means, that the
APS-850CB is mainly a 12V PSU and then generates its 5 and 3.3V from 12V.
This is a modern approach, and since the Load is mainly on 12V it makes a lot of
sense. For almost any PSU which makes use of this topology crossload tests do
not present a problem.
|
Noise |
| Load |
|
| 20 % |
silent |
| 50 % |
well audible |
If we listen closer with this power supply, we hear a
silent noise when the fan is at 20 percent load. At 50% the fan from Globe Fan
with simple ball bearing is audible and at 100% it is well audible.
|
Noise/Ripple @ 100% Load |
| Voltage |
Noise/Ripple Vpp |
| 3.3V |
0.028 |
| 5V |
0.059 |
| 12V |
0.064 |
The noise values are ok, but they
are definitely not excellent. At 100% load we see that the ripple values range
from 28mV to 64mV depending on the rail. Since the 12V ripple performance drastically improves
with just little less 12V load, we don't judge this as a negative point.
Chieftec Navitas 1250W GPM-1250C Review 