Dell Inspiron 14 5440 Owner's Manual

Table 43. System setup options—Virtualization menu (continued)Virtualization SupportEnable Intel VT for Direct I/O When enabled, the computer can perform Virtualization Technology for DirectI/O (VT-d). VT-d is an Intel method that provides virtualization for memory mapI/O.By default, the Enable Intel VT for Direct I/O option is enabled.DMA ProtectionEnable Pre-Boot DMA Support Allows you to control the Pre-Boot DMA protection for both internal and externalports. This option does not directly enable DMA protection in the operatingsystem.NOTE: This option is not available when the virtualization setting for IOMMUis 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 someolder hardware is not DMA capable.Enable OS Kernel DMA Support Allows you to control the Kernel DMA protection for both internal and externalports. This option does not directly enable DMA protection in the operatingsystem. For operating systems that support DMA protection, this settingindicates to the operating system that the BIOS supports the feature.NOTE: This option is not available when the virtualization setting for IOMMUis 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 someolder hardware is not DMA capable.Table 44. System setup options—Performance menuPerformanceMulti-Core SupportMultiple Atom Cores Enables to 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.Intel SpeedStepEnable Intel SpeedStep Technology Enables the computer to dynamically adjust processor voltage and corefrequency, decreasing average power consumption and heat production.By default, the Enable Intel SpeedStep Technology option is enabled.C-State ControlEnable 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 thatthe chipset or platform allows.By default, the Enable C-State Control option is enabled.Enable adaptive C-States for DiscreteGraphicsEnables or disables the system to dynamically detect and allow high usageof a discrete graphics and adjust system parameters for higher performanceduring that time period. This feature requires AC adapter due to higher energyconsumption and will no dynamically activate higher performance without anappropriate AC adapter powering the system. Other settings made to conservepower may block this feature from activating.154 BIOS Setup