Dell DIMENSION E510 DCSM Owner's Manual page 112

Onboard Devices
Integrated NIC
(On default)
Integrated Audio
Controller
USB for Flexbay
(On default)
Video
Primary Video
(Auto default)
Video Memory Size
(8 MB default)
Performance
Hyper-Threading
(On default)
SpeedStep
(On default)
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Appendix
Enables or disables the integrated NIC controller. Settings are On, Off, or On
w/PXE. When the On w/PXE setting is active (available only for setting up
a future boot process), the computer prompts you to press
<Ctrl><Alt><b>.
Pressing this key combination causes a menu to display that allows you to
select a method for booting from a network server. If a boot routine is not
available from the network server, the computer attempts to boot from the
next device in the boot sequence list.
Enables or disables the onboard audio controller.
Enables or disables internal USB for FlexBay.
NOTE:
This USB option appears only if a FlexBay device is installed.
Specifies which video controller is primary when two video controllers are
present on the computer. Auto enables the add-in video controller. Onboard
enables the integrated video controller.
Configures the system memory allocation reserved for the integrated video
controller. Settings are 1MB and 8MB.
Determines whether the physical processor appears as one or two logical
processors. The performance of some applications improve with additional
logical processors installed.
Allows the BIOS to modify the processor fan and speed based on processor
temperature readings.
NOTE:
SpeedStep is not supported by all processors; therefore, this option will
appear only when a supported processor is installed.