Phil Schiller talked about "iPhone 5S
"
This is the first-ever 64-bit processor in a phone of any kind. I
don’t think the other guys are even talking about it yet. Why go
through all this? The benefits are huge. The A7 is up to twice as fast
as the previous-generation system at CPU tasks, and up to twice as
fast at graphics tasks, too.
—Phil Schiller, Apple keynote at 4
Infinite Loop on September 10, 2013
(source: Wikipedia)
Since Memory is only 1GB for "iPhone 5S" then
How is 64 bit CPU faster than 32 bit CPU?
I heard that, in desktop enviroment, to ultilise 64 bit architecture we need more than 4GB memory.
Very confused?
Best Answer
This covers pretty much everything you need to know about benefits of Apple switching to ARM64.
https://www.mikeash.com/pyblog/friday-qa-2013-09-27-arm64-and-you.html
tl;dr conclusion/answer from the link
tl;dr tl;dr