via PiMyLifeUp
With the release of the Raspberry Pi 4 and its more extensive memory options, there has been more and more reason to use a 64-bit operating system.
The most significant advantage of a 64-bit system that the end-user will notice is that a program can access more memory thanks to the larger address size. In fact, a program could theoretically address up to 16 exabytes of memory. That’s an awful lot of memory.
By comparison, a 32-bit system has a limitation of addressing about 4GB of memory. However, in reality, the true amount of memory that can be addressed is closer to 3GB due to some overhead with how registers are used.
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