How can I find out if I have a 64-bit capable CPU?

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Release found: Red Hat Enterprise Linux 3 and later

Problem

You want to know if an x86 system is capable of running 64-bit software.

Resolution

There are two primary modes of operation of the microprocessor architecture: Long mode (lm) and Legacy mode. Long mode is used by 64-bit operating systems. It combines the processor's native 64-bit mode ...

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