Read this: Appleâ€™s iOS 64-bit iUpgrade: Don't expect a 2x performance leap â€¢ The Register
Summary: Apple has said the chip is compatible with all the iOS out there that is still 32-bit. Apple hasnt said how much RAM the 5S contains, but its not going to be of the order that the new 64-bit chip makes possible. Software could use some extra headroom with 64-bit pointers, although that may boil down to effectively 48 bits of useful virtual address space per app the upper bits being reserved for the operating system and unmapped space. - theregister.co.ukwww.theregister.co.ukAppleâ€™s iOS 64-bit iUpgrade: Don'…
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