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Even 64-bit systems today don’t address 64-bits of physical memory. The Arm A78 (a very random example) uses 40 bits of physical address space. The 128 bits wou

Even 64-bit systems today don’t address 64-bits of physical memory. The Arm A78 (a very random example) uses 40 bits of physical address space. The 128 bits would really be for arithmetic and bus widths.

hajile 5y ago
I don't know why you were downvoted. This is absolutely true and even the biggest x86 systems don't address more than 52-bits.
astrange 5y ago
Some 64-bit systems still choose to use 32-bit pointers because it saves so much memory on storing them.