It was pointed out to me on this forum recently that a system that I
was attempting to install i386 onto, should instead have amd64
installed on it.  I have a number of other old systems, all running
i386.

How can I determine whether I can use amd64 on them?

If I can successfully boot from media with a live amd64 system,
then does that prove I can install amd64?  

The media that I boot from might be:
        1. A usb flash drive with:
                a. A live system
                b. An installXX.img
        2. cdXX.iso
        3. bsd.rd, booted from 'boot hd0a:/bsd.rd' on i386 install.
        That is, I am booting the bsd.rd for amd64, not the one for i386.

If it boots successfully from any of these, is it guaranteed that I can
then install and run a 64 bit system?

Thanks

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