Chapter 3 BIOS Setup43Chipset VT-dThis item is used to enable/disable the Intel Virtualization Technology forDirected I/O. For further information, please refer to Intel official website. Primary DisplayThis setting specifies which is your primary graphics adapter. DVMT Pre-AllocatedThis setting defines the DVMT pre-allocated memory. Pre-allocated memoryis the small amount of system memory made available at boot time by thesystem BIOS for video. Pre-allocated memory is also known as lockedmemory. This is because it is “locked” for video use only and as such, isinvisible and unable to be used by the operating system. DVMT Total Gfx MemThis setting specifies the memory size for DVMT. Primary / Secondary IGFX Boot DisplayUse the field to select the type of device you want to use as the primary /secondary display(s) of the system.