When the option is available to choose between a Legacy BIOS Boot Mode or UEFI BIOS Boot Mode operating system installation, the advantages to choosing a UEFI BIOS Boot Mode installation include the following:
Avoids Legacy Option ROM address constraints. For more information, see Legacy Option ROM Allocation.
Supports operating system boot partitions greater than 2 terabytes (2 TB) in size.
Integrates PCIe device configuration utilities within the BIOS Setup Utility menus. For more information, see BIOS Setup Utility Menu Options.
Displays bootable operating system images in the boot list as labeled entities, for example, you will see a Windows boot manager label as opposed to raw device labels.