UEFI firmware 提供以下幾個技術層面上的優點：
• OS Boot from GPT (GUID Partition Table)
UEFI supports a more flexible partitioning scheme based on GPT. GPT disks use 64-bit values to describe
partitions, which allow a maximum disk size of roughly 16.8 million TB and over 100 primary hard disk
• Provides a pre-boot execution environment (not an OS)
UEFI drivers and applications are designed to execute in the boot environment with very few constraints.
Therefore, UEFI can provide a full network stack with high-resolution graphics and access to all devices,
even if no functional operating system is available.
• Removes the Upper Memory Block limit for Option ROM’s
All UEFI implementations that conform to the UEFI specification include an EBC (EFI Byte Code)
interpreter. EBC images are option ROMs that are compatible across all processor architectures.
Additionally, because EBC images are highly compact and universally applicable, option ROMs in a PCI
card can be much smaller than on BIOS systems.
• Compatibility with earlier BIOS
The systems with UEFI firmware can boot operating systems that are UEFI-capable and older operating
systems that support only BIOS.