146 IBM System x3850 X6 and x3950 X6 Planning and Implementation GuideThe 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 duringoperation. Server performance in this mode might be reduced depending on theapplication that is running. Efficiency - Favor Power:Select this choice to configure the server to draw the minimum amount of power andgenerate the least noise. Server performance might be degraded, depending on theapplication that you are running. This mode provides the best features for reducing powerand increasing performance in applications where the maximum bus speeds are notcritical. Efficiency - Favor Performance:Select this choice to maintain the optimal balance between performance and powerconsumption. The server generally produces the best performance per watt while it is inthis 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. Thisis the only choice that enables you to change the low-level IMM2 settings that affect theperformance and power consumption of the server. Maximum Performance:Select this choice to achieve the maximum performance for most server applications. Thepower consumption in this mode is often higher than in the Efficiency - Favor Power orEfficiency - Favor Performance mode.Power saving and performance are also highly dependent on the hardware and softwarerunning on the system.5.3 UEFI common settingsThe UEFI default settings are configured to provide optimal performance with reasonablepower consumption. Other operating modes as described in 5.2.1, “Operating modes” onpage 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 X6servers.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
