IBM System x3300 M4 Installation And Service Manual page 136

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System x3300 M4 Type 7382: Installation and Service Guide
Select this choice to enable or disable processor performance states.
Enabling processor performance states (Intel Speedstep Technology) saves
power by reducing speed and voltage as the microprocessor utilized is
reduced.
Note: Some operating systems must have the correct power profile selected
to take advantage of this feature.
- C1 Enhance Mode
Select this choice to enable or disable C1E (C1 Enhanced) state. Enabling
C1E (C1 Enhanced) state can save power by halting CPU cores that are
idle.
Note: An operating system that supports C1E state must be installed to
take advantage of this feature. Changing this setting will be effective after
the next system reboot.
- QPI Link Frequency
Select this choice to determine the desired microprocessor QPI link
frequency. Maximum performance mode maximizes performance. Balanced
mode offers a balance between performance and power. Minimal power
maximizes power savings.
- Turbo Mode
Select this choice to enable or disable turbo mode. Enabling turbo mode
can boost the overall microprocessor performance when all microprocessor
cores are not fully utilized. A microprocessor core can run above its rated
frequency for a short period of time when it is in turbo mode.
- CPU C-States
Select this choice to enable or disable ACPI C2 Processor Power states. It
will be effective after the next system reboot.
- Package ACPI CState Limit
Select this choice to determine the level of C-state. Selecting a higher
C-state limit allows the microprocessors to consume less power when they
are idle. If you experience problems with legacy operating systems, set the
ACPI Cstate limit to C2.
- Power/Performance Bias
Select this choice to determine how the power management of the
microprocessor is controlled. You can choose either Platform Controlled
(system) or OS Controlled (operating system) to control the setting. Not all
operating systems support this feature.
- Platform Controlled Type
Select this choice to determine how to balance between performance and
power consumption. Choosing Maximum Performance will disable power
management functions and allow the most aggressive use of turbo.
Choosing Minimal Power will maximizes the use of power management
features for least power consumption and disable turbo.
– Legacy Support
Select this choice to view or set legacy support.
- Force Legacy Video on Boot
Select this choice to force INT video support, if the operating system does
not support UEFI video output standards.
- Rehook INT 19h