EFI strings are loaded upon successful loading of the com.apple.Boot.plist file located in /Library/Preferences/SystemConfiguration/ folder. This file is loaded upon boot-up of your partition. The strings are placed in this file in HEX format so that the system can better see the hardware on a "closer to binary" level without it getting as messy as machine code. The EFI string points to the hardware and tells the system what it is so no external kernel extensions are needed. However, I have noticed the CI/QE capabilities sometimes are hit-and-miss with EFI. Properly done, it would allow your system to run more natively. If not, then you'll have to resort to the kernel extensions for your model (as of now, I'd have to look them up... not on the top of my head right now).

---