Asus Z8NA-D6 - Manual (Page 55)

ASUS Z8NA-D6 Series 2-35
10. BMC header (BMC_FW1) (Z8NA-D6 model only)
The BMC connector on the motherboard supports an ASUS ® Server
Management Board 4 Series (ASMB4).
11. Power Supply SMBus connector (5-pin PSUSMB1)
This connector allows you to connect SMBus (System Management Bus) to
the power supply unit to read PSU information. Devices communicate with an
SMBus host and/or other SMBus devices using the SMBus interface.