Table 12. Processors details (continued)
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.
Uncore Frequency Scaling
• Enable
• Disable
When enabled, the CPU uncore will dynamically change
speed based on the workload. All miscellaneous logic
inside the CPU package is considered to be the uncore.
Enable is the default setting.
MONITOR/MWAIT
• Enable
• Disable
MONITOR/MWAIT instructions are used to engage C-
states. Some operating systems will re-enable C-states
even when they are disabled in setup. To prevent this,
disable MONNITOR/MWAIT. Please choose [Custom
Mode] in “Operating Mode” and [Disable] in "C-States"
located under “System Setting” submenu.
Enable is the default setting.
This item can be changed after the steps as below.
• 1. Operating Modes -> Custom
• 2. C-states -> Disable
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.
SNC
• Enable
• Disable
SNC (sub NUMA cluster) partitions the cores and last
level cache into clusters with each cluster bound to a set
of memory controllers in the system. SNC improves
average latency to the last level cache.
Disable is the default setting.
Snoop Preference
• Home Snoop
Plus
• Home Snoop
Select the appropriate snoop mode based on the
workload. Setting the snoop mode preference does not
always guarantee that it will be selected. The mode will be
changed if the current hardware configuration does not
support the desired mode. Also not that SNC has priority
over the snoop mode.
Home Snoop Plus is the default setting.
Chapter 3. System configuration and boot management 35
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