To find information about your CPU including architecture, execute lscpu in terminal.

Example:

lscpu

yields …

Architecture:          i686
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                4
On-line CPU(s) list:   0-3
Thread(s) per core:    2
Core(s) per socket:    2
Socket(s):             1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 42
Stepping:              7
CPU MHz:               2301.000
BogoMIPS:              4589.37
Virtualization:        VT-x
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              3072K
For Intel systems, the Vendor ID is - GenuineIntel and for AMD - AuthenticAMD.

But they are compatible. It is a bit of an historical artifact in that AMD was the creator of the 64 bit ‘long’ mode, and later Intel matched that creation. But naming often refers to any 64 bit binary as an AMD/64bit format, usually with the label ‘AMD64’.