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"The reveal has also been big on buzzwords like "5 billion transistors" and "native 64-bit architecture" that don't really mean much without any context, but Wired's Gadget Lab has some more information for us: much like the PlayStation 4, the One uses a custom-designed APU from AMD (hence, 64-bit), and this APU apparently brings the CPU cores, the GPU, the memory, and the other necessary controller chips into a single 40nm SoC (hence the sky-high transistor count)."
Xbone will use a 40nm process (so high transistor count) insted the 28nm used by PS4.