Table 40. System Setup options—Virtualization menu(continued)
Virtualization Support
NOTE: This option is not available when the virtualization setting for IOMMU
is disabled (VT-d/AMD Vi).
By default, the Enable Pre-Boot DMA Support option is enabled.
For additional security, Dell Technologies recommends keeping the Enable Pre-
Boot DMA Support option enabled.
NOTE: This option is provided only for compatibility purposes, since some
older hardware is not DMA capable.
NOTE: To view this option, enable Advanced Setup mode as described in
View Advanced Setup options.
Enable OS Kernel DMA Support Allows you to control the Kernel DMA protection for both internal and external
ports. This option does not directly enable DMA protection in the operating
system. For operating systems that support DMA protection, this setting
indicates to the operating system that the BIOS supports the feature.
NOTE: This option is not available when the virtualization setting for IOMMU
is disabled (VT-d/AMD Vi).
By default, the Enable OS Kernel DMA Support option is enabled.
NOTE: This option is provided only for compatibility purposes, since some
older hardware is not DMA capable.
NOTE: To view this option, enable Advanced Setup mode as described in
View Advanced Setup options.
Internal Port DMA Compatibility Mode Allows you to control the Internal Port DMA Compatibility for both internal and
external ports.
By default, the Internal Port DMA Compatibility Mode option is disabled.
NOTE: To view this option, enable Advanced Setup mode as described in
View Advanced Setup options.
Table 41. System Setup options—Performance menu
Performance
Multi-Core Support
Multiple Atom Cores Change the number of Atom cores available to the operating system. The default
value is set to the maximum number of cores.
By default, the All Cores option is selected.
NOTE: To view this option, enable Advanced Setup mode as described in
View Advanced Setup options.
Intel SpeedStep
Enable Intel SpeedStep Technology Enables the computer to dynamically adjust processor voltage and core
frequency, decreasing average power consumption and heat production.
By default, the Enable Intel SpeedStep Technology option is enabled.
NOTE: To view this option, enable Service options as described in View
Service options.
C-State Control
Enable C-State Control Enables or disables the ability of the CPU to enter and exit low-power state.
When disabled, it disables all C-states. When enabled, it enables all C-states that
the chipset or platform allows.
By default, the Enable C-State Control option is enabled.
108 BIOS Setup
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