Re: will exynos note 4 get a 64bit performance boost from lollipop?
Yes. That doesn't mean that you'll necessarily see much of a performance boost, though. The main difference the user sees between a 32 bit CPU and a 64 bit CPU is that 32 bits (numerically) can only hold a number that's 4GiB - 1. (Like 3 digits can only hold a number that's 1,000 - 1.) 64 bits can hold a number that's 18EiB - 1, so you can have lots of memory in a 64 bit device. The amount of RAM in your Note 4 won't increase when you get Lollopop, though - that's a hardware thing. But they can now make phones without regard to RAM size for the foreseeable future. 3GB is about the limit with 32 bits, with 64 bits if they wanted to come out with a phone with 32GB of RAM, or 320GB of RAM, the only problems would be size, heat and power. (Storage is different - we can, and do, currently address storage devices in the Terabyte range. And an exFAT-formatted card can hold 18EiB if the card is large enough - again, size and power will be the limiting factors for the foreseeable future. [I'm not going to say something like what Bill Gates didn't say, despite all the stories - that 18EiB is more than anyone will ever need. 100 years from now, that statement might be just as silly as the "640KB is more than ..." that Gates didn't say.])
The fact that data can be transferred 64 bits at a time, rather than 32 bits at a time, will give the phone a slight increase in performance, but that increase alone is nothing to write home about. (If they get the bugs out of Lollipop, there may be some big improvements in performance due to other changes.)
If youu want to see the next major changes in computing (like the change from writing numbers on paper to computers) you'll have to wait for quantum computers. That will make the supercomputers of today look like a child's first computer toy.
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