If you're addressing more than 4GB of physical memory (actually, ~3 to 3.5GB ish), you're using PAE, 32 vs 64 bit doesn't have any relevance to this. ARMv8 sti

If you're addressing more than 4GB of physical memory (actually, ~3 to 3.5GB ish), you're using PAE, 32 vs 64 bit doesn't have any relevance to this. ARMv8 still uses a modified version of LPAE and x86_64 also uses an extension of PAE when running in 64bit mode. I don't know of a 64 bit architecture that doesn't use a PAE style table mapping system, i.e. none are directly addressing physical memory (I'm sure there is an arch out there somewhere that does, just not one I know of one in common use).