IBM System x3550 M3 Type 4254

Table 2. Power supply efficiency (PSU 1)
IRMS A PF ITHD (%) Load (%)
Input
Watts
Output
Watts
Efficiency
%
0.41 0.811 39.8% 10% 77.25 67.50 87.38%
0.72 0.901 30.5% 20% 148.45 134.74 90.76%
1.65 0.956 21.8% 50% 361.99 336.34 92.91%
3.28 0.976 17.5% 100% 736.58 670.10 90.97%
PSU 2:
Table 3. Power supply efficiency (PSU 2)
IRMS A PF ITHD (%) Load (%)
Input
Watts
Output
Watts
Efficiency
%
0.50 0.694 19.02% 10% 79.4 68.2 85.9%
0.74 0.867 15.1% 20% 148.4 134.8 90.8%
1.63 0.968 4.85% 50% 362.1 336.1 93.0%
3.24 0.988 5.3% 100% 737.3 672.3 91.2%
Maximum power (watts):
See Power supply.
Idle state power (watts):
129
Sleep mode power (watts):
N/A for servers
Off mode power (watts):
Not available
Noise levels (the declared A-weighed sound power level of the computer):
See Acoustical noise emissions.
Test voltage and frequency:
230V/50Hzor60Hz
Total harmonic distortion of the electricity supply system:
The maximum harmonic content of the input voltage waveform will be
equal or less than 2%. The qualification is compliant with EN 61000-3-2.
Information and documentation on the instrumentation set-up and circuits used
for electrical testing:
ENERGY STAR Test Method for Computer Servers; ECOVA Generalized
Test Protocol for Calculating the Energy Efficiency of Internal Ac-Dc and
Dc-Dc Power Supplies.
Measurement methodology used to determine information in this document:
ENERGY STAR Servers Version 2.0 Program Requirements; ECOVA
Generalized Test Protocol for Calculating the Energy Efficiency of Internal
Ac-Dc and Dc-Dc Power Supplies.
Chapter 1. The IBM System x3550 M3 server 9