![]() ![]() ![]() That's a bus in the CPU that determines how much real, physical RAM can be installed, and that's almost always substantially less than 64 bits, perhaps 36 to 40 bits. What's often overlooked is the Address Bus. The first item allows a theoretical maximum of 2^64 = 16 exabytes of virtual memory and the second allows 64-bit sized chunks of memory to be loaded from or stored to memory. Here's what I learned from Intel.ĬPUs that are labelled as 64-bits have 64-bit internal registers and a 64-bit data path to memory. ![]() While all provide for a 64-bit virtual memory space, the amount of physical RAM that can be installed is substantially less. There has been a lot of discussion lately about how much memory the latest 64-bit Macs can access.
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