As servers grew to house terabytes of RAM and hundreds of logical processor cores, the 32-bit limits of the SMBIOS 2.x entry point became a bottleneck. The table structures could not easily scale past physical memory limits or comfortably index hundreds of discrete processor entities without overflowing.
If you are running a system in legacy BIOS mode (CSM enabled) rather than native UEFI, the firmware often defaults to SMBIOS 2.6 or 2.7. Native UEFI typically supports SMBIOS 3.0+. smbios version 26
: Flags indicating if the CPU supports 64-bit architecture, virtualization extensions (Intel VT-x / AMD-V), or power management features. System Slots (Type 9) Expansion As servers grew to house terabytes of RAM