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146 IBM System x3850 X6 and x3950 X6 Planning and Implementation Guide

The Operating Modes are as follows; the default mode is Efficiency - Favor Performance:

򐂰 Minimal Power:

Select this choice to minimize the absolute power consumption of the system during

operation. Server performance in this mode might be reduced depending on the

application that is running.

򐂰 Efficiency - Favor Power:

Select this choice to configure the server to draw the minimum amount of power and

generate the least noise. Server performance might be degraded, depending on the

application that you are running. This mode provides the best features for reducing power

and increasing performance in applications where the maximum bus speeds are not

critical.

򐂰 Efficiency - Favor Performance:

Select this choice to maintain the optimal balance between performance and power

consumption. The server generally produces the best performance per watt while it is in

this mode. No bus speeds are derated in this mode. This is the

default mode.

򐂰 Custom Mode:

Select this choice only if you understand the function of the low-level IMM2 settings. This

is the only choice that enables you to change the low-level IMM2 settings that affect the

performance and power consumption of the server.

򐂰 Maximum Performance:

Select this choice to achieve the maximum performance for most server applications. The

power consumption in this mode is often higher than in the Efficiency - Favor Power or

Efficiency - Favor Performance mode.

Power saving and performance are also highly dependent on the hardware and software

running on the system.

5.3 UEFI common settings

The UEFI default settings are configured to provide optimal performance with reasonable

power consumption. Other operating modes as described in 5.2.1, “Operating modes” on

page 145 are also available to meet various power and performance requirements. However,

individual system settings enable users to fine-tune the desired characteristics of the IBM X6

servers.

This section describes these individual system settings:

򐂰 5.3.1, “System power settings” on page 147

򐂰 5.3.2, “Processor settings” on page 148

򐂰 5.3.3, “Memory settings” on page 149

򐂰 5.3.4, “ServeRAID M5210 RAID controller configuration” on page 151

IBM X3850 X6 User Manual

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