Does pfSense support 64 bit systems

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Yes. All supported releases of pfSense are 64-bit capable when using pfSense images labeled with "amd64" for both Intel and AMD CPUs using the AMD64 architecture, also known as x86-64.

32-bit images and support (i386) will be deprecated with the pfSense 2.4-RELEASE and from it 64-bit systems will be supported exclusively.

32-bit images can run on 64-bit hardware, but this is not recommended and should not be done. If the hardware is 64-bit capable, run 64-bit images.