Subject: Technical Overview and Key Features of SMBIOS v2.6 Date of Specification Release: circa 2007 (Developed by the DMTF - Distributed Management Task Force)
Macs using SMBIOS 2.6 typically have Boot ROM versions from the 2008–2011 era.
Under the version 2.6 specification, information is organized into structures smbios version 26 top
Modern RAM reporting owes much to SMBIOS 2.6. The Memory Device (Type 17) structure received significant upgrades:
Version 2.6 standardized several new structure types to cover system interconnects and power: Report: System Management BIOS (SMBIOS) Version 2
| Feature | SMBIOS 2.6 | SMBIOS 3.0 (2015) | SMBIOS 3.5 (2019) | |--------|-------------|--------------------|--------------------| | Max memory address | 4 GB (32-bit) | >4 GB (64-bit offsets) | 64-bit with new entry point | | UEFI support | Basic | Full | Full + secure boot details | | Memory type reporting | DDR, DDR2, DDR3 | DDR3, DDR4 | DDR4, DDR5 | | Processor family IDs | Limited (less than 0x1FF) | Extended (up to 0x3FFF) | Full ARM support | | Table size limit | ~64 KB | ~4 MB | Unlimited via 64-bit |
For more technical details, you can download the full SMBIOS 2.6 Reference Specification directly from DMTF. SMBIOS - DMTF Max RAM is likely 4GB–8GB non-ECC No NVMe
Look for structures like Type 4 (Processor), Type 16 (Memory Array), and Type 17 (Memory Device) to see v2.6 fields.