Acer AB460 F1 - Manual (Page 195)

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C6 State: This feature allows the user to decide how the onboard 5500
Series processor will act at C6 State.
C-State package limit setting: If set to Auto, the BIOS will automatically
set the limit on the C-State package register.
C1 Auto Demotion: When Enabled, the CPU will conditionally demote
C3, C6 or C7 requests to C1 based on un-core auto-demote
information.
C3 Auto Demotion: When Enabled, the CPU will conditionally demote
C6 or C7 requests to C3 based on un-core auto-demote information.
Clock Spread Spectrum: Select Enable to use the feature of Clock
Spectrum, which will allow the BIOS to monitor and attempt to reduce
the level of Electromagnetic Interference caused by the components
whenever needed.
Advanced Chipset Control
The items included in the Advanced Settings submenu are listed below:
Figure 3-113. Advanced Chipset Control