These motherboards are typically installed with other equipment into a larger enclosure. They offer a full set of peripheral ports in a small form factor. Some include PC104 connectors for adding additional IO functionality. The size matches a desktop spinning hard drive.

MF10-90
Embedded Motherboard 3.5" with 11th GEN i5 CPU
11,730.00 11730.0 ZAR Excl. VAT
WAFER-EHL2-J6412
SBC 3.5 inch with J6412 CPU and 8GB RAM onboard
6,570.00 6570.0 ZAR Excl. VAT
MF05V20-A1
SBC 3.5" with i5-1145G7E CPU VPRO FTPM
16,780.00 16780.0 ZAR Excl. VAT
NF931G32-4105
SBC 3.5 J4125 SODDR4
3,845.00 3845.0 ZAR Excl. VAT
WAFER-BT-J19001
SBC 3.5 2Ghz QC 10W HS
7,355.00 7355.0 ZAR Excl. VAT