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#11
Actually, it is a bit more subtle than that. The Atom CPUs are actually 64bit capable, but the tablet firmware is hard set to only boot in 32bit UEFI mode. The reason for this is simply that 32 bit installs use less disk space even in in CompactOS mode.
Users have (allegedly) managed to do fancy reflashing of firmware with custom bootloaders to make such devices 64bit capable. This is far beyond abilities of most mortals.