mine does.
its an old asus nrl-ls server. it's loaded with linux and lots of drives, and sits 'quietly' in the corner as a ftp/print/smb/http/router etc
then the other day, with nothing else to do, i re-read the manual (sad!) and came across this....
SMBus connector (6-1 pin J5)
This connector allows you to connect SMBus (System Management
Bus) devices. Devices communicate with an SMBus host and/or other
SMBus devices using the SMBus interface. SMBus is a specific
implementation of an I2C bus, a multi-device bus that allows multiple
chips to connect to the same bus and enable each one to act as a
master by initiating data transfer.
pin1 floating
pin2 smbclock
pin3 nc
pin4 gnd
pin5 smbdata
pin6 +3.3v