FreeBSD Supported Processors and System Boards (pfSense too)

The official word on what hardware FreeBSD supports.  NOTE: pfSense runs on FreeBSD, so it can run on this hardware also, but for a fast LAN, use more than the minimum.

https://www.freebsd.org/releases/14.0R/hardware/

"FreeBSD supports the AMD64 ("Hammer") and Intel® EM64T architectures. AMD64 (also known as x86-64) is a fully-supported Tier 1 architecture. AMD64 supports all modern x86 processors. This release incorporates optimizations and enhancements to leverage the full capabilities of FreeBSD/amd64-based systems, delivering improved performance across a wide range of workloads."

"FreeBSD supports 64-bit ARM (known as arm64 or AArch64) as a Tier-1 architecture."  This includes the Raspberry Pi systems: https://wiki.freebsd.org/arm/Raspberry%20Pi

This doesn't necessarily mean the pfSene can be run on RPI - more research is needed.

Raspberry Pi (5) pfSense Using a VM: Complete Guide to Building a Virtual Firewall:

https://www.sunfounder.com/blogs/news/raspberry-pi-pfsense-using-a-vm-complete-guide-to-building-a-virtual-firewall?srsltid=AfmBOorKD--uAzDntQHywF1nFU0ENCSdWPVNook4P6nroqvSK1w6MADN

"IMPORTANT: pfSense is not officially supported on ARM-based architectures, which means you'll need to rely on virtualization (e.g., QEMU) to get it working"

"Virtualizing pfSense on top of Raspberry Pi OS introduces additional complexity in setup and maintenance."