Table 10. Operating modes details (continued)
UPI Link Disable
• Enable All Links
• Disable 1 Link
Disabling one of the CPU UPI links can save power. If
maximum performance is desired, all UPI links should be
left enabled. When a preset mode is selected, the low-
level settings are not changeable and will be grayed out. If
user would like to change the settings, please choose
[Custom Mode] in “Operating Mode” located under
“System Setting” submenu.
Enable All Links is the default setting.
Turbo Mode
• Enable
• Disable
Enabling turbo mode can boost the overall CPU
performance when all CPU cores are not being fully
utilized. A CPU core can run above its rated frequency for
a short period of time when it is in turbo mode. When a
preset mode is selected, the low-level settings are not
changeable and will be grayed out. If user would like to
change the settings, please choose [Custom Mode] in
“Operating Mode” located under “System Setting”
submenu.
Enable is the default setting.
Energy Efficient Turbo
• Enable
• Disable
When energy efficient turbo is enabled, the CPU’s optimal
turbo frequency will be tuned dynamically based on CPU
utilization. The power/performance bias setting also
influences energy efficient turbo. When a preset mode is
selected, the low-level settings are not changeable and
will be grayed out. If user would like to change the
settings, please choose [Custom Mode] in “Operating
Mode” and [Enable] in "Turbo Mode" located under
“System Setting” submenu.
Enable is the default setting.
C-States
• Legacy
• Autonomous
• Disable
C-states reduce CPU idle power. When [Legacy] is
selected, the operating system initiates the C-state
transitions. For E5/E7 CPUs, ACPI C1/C2/C3 map to Intel
C1/C3/C6. For 6500/7500 CPUs, ACPI C1/C3 map to
Intel C1/C3 (ACPI C2 is not available). Some OS SW may
defeat the ACPI mapping (e.g. intel_idle driver). When
[Autonomous] is selected, HALT and C1 request get
converted to C6 requests in hardware. When a preset
mode is selected, the low-level settings are not
changeable and will be grayed out. If user would like to
change the settings, choose [Custom Mode] in
“Operating Mode” located under “System Setting”
submenu.
Autonomous is the default setting.
Chapter 3. System configuration and boot management 29
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