Gigabyte R260-R3C Service Manual page 54

Option ROM execution
Network
Controls the execution UEFI and Legacy PXE OpROM.
Options available: Do not launch/UEFI/Legacy. Default setting is Legacy.
Storage
Controls the execution UEFI and Legacy Storage OpROM.
Options available: Do not launch/UEFI/Legacy. Default setting is Legacy.
Video
Controls the execution UEFI and Legacy Video OpROM.
Options available: Do not launch/UEFI/Legacy. Default setting is Legacy.
Other PCI devices
Determines OpROM execution policy for devices other than network, Storage, or Video.
Options available: UEFI/Legacy. Default setting is UEFI.
BIOS Setup - 54 -