Chapter 2. IBM eX5 technology 39
Figure 2-19 Operating modes in UEFI
Acoustic Mode
Figure 2-20 shows the Acoustic Mode predetermined values. They emphasize power-saving
server operation for generating less heat and noise. In turn, the system is able to lower the fan
speed of the power supplies and the blowers by setting the processors, QPI link, and memory
subsystem to a lower working frequency. Acoustic Mode provides lower system acoustics,
less heat, and the lowest power consumption at the expense of performance.
Figure 2-20 Acoustic Mode predetermined values
Efficiency Mode
Figure 2-21 on page 40 shows the Efficiency Mode predetermined values. This operating
mode provides the best balance between server performance and power consumption. In
short, Efficiency Mode gives the highest performance per watt ratio.
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