In this thread, the only marketing BS is coming from you. There is "nothing to add" because to the end user, nothing is different between 32bit and 64bit devices that can be traced directly to 32/64. You can do the exact same things on each device.
If iOS starts pushing 4gb+ and other devices can't because of 32bit, then we can talk about advantages. (I don't believe this will actually be the case at any point)
Everybody is pretty much wrong in here, there are instant benefits to 64 bit already even under 4 GB of RAM, the ARMv8 architecture brings more CPU registers, and other things
When apps get recompiled to 64 bit code, automatically they gain 10% performance boost on that alone due to the fact that the app can use more CPU registers now, (and not even accounting other benefits of going to 64 bit, but Touch ID is not possible without the 64 bit chip because it uses the brand new ARM TrustZone that comes with ARMv8 to make sure our fingerprints are secure and stay secure
)
Anand shows differences with running applications in AArch64 (ARM 64 bit) and AArch32 (ARM 32 bit)
http://www.anandtech.com/show/7335/the-iphone-5s-review/4
"Apple isn’t very focused on delivering a larger memory address space today however. As A64 is a brand new ISA, there are other benefits that come along with the move. Similar to the x86-64 transition, the move to A64 comes with an increase in the number of general purpose registers. ARMv7 had 15 general purpose registers (and 1 register for the program counter), while ARMv8/A64 now has 31 that are each 64-bits wide. All 31 registers are accessible at all times. Increasing the number of architectural registers decreases register pressure and can directly impact performance. The doubling of
the register space with x86-64 was responsible for up to a 10% increase in performance."
"ARMv8 also adds some new cryptographic instructions for hardware acceleration of AES and SHA1/SHA256 algorithms.
These hardware AES/SHA instructions have the potential for huge increases in performance, just like we saw with the introduction of AES-NI on Intel CPUs a few years back. Both the new advanced SIMD instructions and AES/SHA instructions are really designed to enable a new wave of iOS apps."
ARMv8 being 64 bit on ARM chips,
Not only that, 64 bit chips run 32 bit code better then a 32 bit processor can and does, in Geekbench 3 running the application in 32 bit mode on the iPhone 6 and 6 Plus gives a single core score of about 1050 and multi core score of about 2100
When Geekbench 3 is in 64 bit mode (the scores we have seen already) the 6 and 6 Plus get about 1625 single core score and 2950 multi core score in Geekbench 3, quite a difference between 32 bit and 64 bit there
People who spout "64 bit is a gimmick and is useless under 4GB of RAM" do not know what they are talking about, this is why the Qualcomm executive who claimed the A7 was a "gimmick" is well was the former executive, he got fired pretty much immediately because that was such a ridiculous non sensical statement
You can't do computational photography on 32 bit and
You cannot have a secure enclave for touch ID and biometrics without 64-bit.
All applications by February 2015 have to be submitted with 64-bit code/support in it, this means everyone with a A7 device and up is and are going to get performance enhancements and stability improvements From the 64-bit architecture instantly, we will see a nice speed boost and improvements from our apps from them being updated to 64 bit, the ones that are not updated yet to 64 bit, and that is just one of many ways developers gain extra performance , whether it is from the hardware or software improvements, 64 bit is no gimmick at all, once again just ask the Qualcomm executive who said it was , see where he is at now, FIRED!
Apple A7 runs 64 bit code 30% better and faster then 32 bit code, and the A8 runs 64 bit code 40% faster and better then 32 bit code, switching apps to AArch64\64-bit binary and code is going to give 5S/Air/Air 2/Mini 2 with A7/6 and 6 Plus about a 30-40% performance boost in applications that are not updated yet.... Can't wait