I have the same issue. I just completed a build with a core i7-6700k using an Asus Prime Z270-A Rev 1.xx. When I click on Motherboard in AIDA 5.80.4000 it shows the following:
Field Value
Motherboard Properties
Motherboard ID 63-0100-000001-00101111-051315-Chipset$0AAAA000_BIOS DATE: 12/27/16 21:53:33 VER: 05.0000C
Motherboard Name Unknown Motherboard
Front Side Bus Properties
Bus Type BCLK
Real Clock 100 MHz
Effective Clock 100 MHz
Memory Bus Properties
Bus Type Dual DDR4 SDRAM
Bus Width 128-bit
DRAM:FSB Ratio 32:3
Real Clock 1067 MHz (DDR)
Effective Clock 2133 MHz
Bandwidth 34133 MB/s
Chipset Bus Properties
Bus Type Intel Direct Media Interface v3.0