64 bit - How do you determine that your hardware is 64 bit capable when there is no operating system installed?

How do you determine that your hardware is 64 bit capable when there is no operating system installed?

Answer

Open up the computer and look at your CPU and motherboard to get the model numbers, then look them up at the manufacturers (i.e.: Intel, AMD) and check the specifications provided.

Alternatively you could boot from a Linux LiveCD or alike and use that OS to detect the capabilities (no OS installation on the machine required).