The GEEKOM IT15 is a mini PC that measures 135.5 x 115.5 x 34.5mm (5.33″ x 4.55″ x 1.36″) and features support for up to 64GB of DDR5-5600 memory, up two M.2 SSDs, and a 2.5 inch hard drive or SSD.

OPNsense will run on just about anything, including a low-power Raspberry Pi single-board computer (SBC). I have an old ...