Asus STRIX X99 Manual page 101

Setup Mode [EZ Mode]
[Advanced Mode]
[EZ Mode]
CSM (Compatibility Support Module)
This item allows you to configure the CSM (Compatibility Support Module) items to fully
support the various graphics, bootable devices, and add-on devices for a better compatibility.
Launch CSM [Enabled]
[Auto] The system will automatically detect the states of bootable devices
and the add-on devices for CSM support.
[Enabled] For a better compatibility, enable the CSM to fully support the non-
UEFI driver add-on devices or the Windows
[Disabled] Disable the CSM to fully support the Windows secure update and
secure boot.
The following items appear only when you set the Launch CSM to [Enabled].
Boot Device Control [UEFI and Legacy OPROM]
This item allows you to select the devices boot-up mode by the devices
specification.
Configuration options: [UEFI and Legacy OPROM] [Legacy OPROM only]
Boot from Network Devices [Legacy only]
This item allows you to select the type of the onboard LAN controllers and
installed LAN cards.
Configuration options: [Ignore] [Legacy only] [UEFI driver first]
Boot from Storage Devices [Legacy only]
This item allows you to select the type of storage devices that will run first
during the system boot.
Configuration options: [Ignore] [Legacy only] [UEFI driver first]
Boot from PCI-E/PCI Expansion Devices [Legacy only]
This item allows you to select the type of PCI-E/PCI expansion devices that
will run first during the system boot.
Configuration options: [Legacy only] [UEFI driver first]
ASUS STRIX X99 GAMING
This item allows you to go to Advanced Mode of the BIOS
after POST.
This item allows you to go to EZ Mode of the BIOS after POST.
[UEFI only]
UEFI mode.
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