Result Analysis and Discussion
Efficiency 115V
|
| Load |
Pin(W) |
Pout(W) |
Efficiency |
| 20 % |
199.50 |
173.60 |
87.02 % |
| 50 % |
490.10 |
431.50 |
88.04 % |
| 100 % |
1020.30 |
853.90 |
83.69 % |
The 80Plus Bronze certification requirements (82% -
85% - 82%) 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 as 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) |
| 20 % |
5V |
2.7 |
5.09 |
| 3.3V |
2.7 |
3.31 |
| 12V |
12.0 |
12.20 |
| 5VSB |
0.5 |
5.10 |
|
|
| 50 % |
5V |
6.7 |
5.03 |
| 3.3V |
6.7 |
3.32 |
| 12V |
30.0 |
12.20 |
| 5VSB |
1.3 |
5.02 |
|
|
| 100 % |
5V |
13.3 |
5.01 |
| 3.3V |
13.3 |
3.29 |
| 12V |
60.0 |
12.10 |
| 5VSB |
2.6 |
5.01 |
The Voltage Regulation
of this PSU is quite surprisingly good. It makes use of a DC-DC topology. This means, that the
SRM-850 is mainly a 12V PSU and then generates its 5V and 3.3V from 12V rail. This is a
modern approach, and since the load is mainly on the 12V rail, the design 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 % |
Audible |
| 100 % |
Loud |
Noise level results are good as the PSU can be
categorized silent at 20% load. At 50% load the PSU is audible but still
sufficiently quiet. At full load, the noise is a different story as that fan was
never meant to spin at high RPM and it makes the PSU quite loud.
|
Noise/Ripple |
| Voltage |
Noise/Ripple Vpp |
| 5V |
0.019 |
| 12V |
0.030 |
| -12V |
0.071 |
| 3.3V |
0.026 |
| +5VSB |
0.021 |
The noise values
are OK and within the ATX norm.
OCZ Fatal1ty 750W Review 