PAE means you have longer physical addresses, but pointers are always virtual addresses. That is, the difference is only visible in the layout of the page tables.
Segment+offset is something else, but even on 32-bit x86 the segments were almost always set to base 0, and AMD64 dropped most of the segment mechanism. The exception on both is using segments to access thread-local data, but even then it's used just as an offset into the same flat address space.
Segment+offset is something else, but even on 32-bit x86 the segments were almost always set to base 0, and AMD64 dropped most of the segment mechanism. The exception on both is using segments to access thread-local data, but even then it's used just as an offset into the same flat address space.