“New in Version 3.1, SMBIOS now includes support for mini PCIe and Trusted Platform Module (TPM) devices, and adds new chassis types for Internet of Things (IoT) gateways, as well as embedded, mini and stick PCs. In addition, the standard has been updated to support extended BIOS ROM size and cache sizes greater than 2047 MB.[…]”

http://www.dmtf.org/content/dmtf-releases-updated-smbios-standard

http://www.dmtf.org/standards/smbios