Dell OptiPlex 990 (Early 2011) - Manual (Page 67)

Performance
Intel® TurboBoost™ Allows you to enable or disable Inel TurboBoost mode of the
processor.
• Disabled — Does not allow the TurboBoost driver to
increase the performance state of the processor
above the standard performance.
• Enabled — Allows the Intel Turbo driver to increase
the performance of the CPU or graphics processor.
This option is enabled by default.
Hyper-Thread Control Allows you to enable or disable the Hyper-Threading
Technology. This option is enabled by default.
Power Management
AC Recovery Determines how the system responds when AC power is re-
applied after a power loss. You can set the AC Recovery to:
• Power Off (default)
• Power On
• Last State
Auto On Time Allows you to set the option to automatically turn on the
computer. Time is kept in standard 12-hour format
(hour:minutes:seconds). Change the startup time by typing the
values in the time and AM/PM fields.
NOTE: This feature does not work if you turn off your
computer using the switch on a power strip or surge
protector or if Auto Power is set to disabled.
Deep Sleep Control Allows you to define the controls when Deep Sleep is enabled.
• Disabled
• Enabled in S5 only
• Enabled in S4 and S5
This option is Disabled by default.
Fan Control Override Controls the speed of the system fan. This option is disabled by
default.
NOTE: When enabled, the fan runs at full speed.
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