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DOWNLOADBut the most crucial consequence is . A 32-bit CPU can theoretically access $2^32$ unique memory addresses, which equals exactly 4 gigabytes (GB) of RAM. In the 1980s and 1990s, that number seemed laughably huge—computers ran on kilobytes of RAM. By the late 2000s, however, 4GB became a frustrating wall. You couldn't use more than 4GB of RAM on a standard 32-bit system (and often less due to hardware reservations). That limitation ultimately sounded the death knell for the architecture.
But the most crucial consequence is . A 32-bit CPU can theoretically access $2^32$ unique memory addresses, which equals exactly 4 gigabytes (GB) of RAM. In the 1980s and 1990s, that number seemed laughably huge—computers ran on kilobytes of RAM. By the late 2000s, however, 4GB became a frustrating wall. You couldn't use more than 4GB of RAM on a standard 32-bit system (and often less due to hardware reservations). That limitation ultimately sounded the death knell for the architecture.