thanks for the response. by fixing up the machine i was talking about, i was looking to put in a new cpu/mobo/ram/gpu. i realize that the UEFI won't be supported on older motherboards.
currently it doesn't seem like there's anything that natively uses the technology and i'd like to find out if there are any new boards in production currently that do, so let me rephrase that to 'what NEW boards support it?'