I see no image attached.
Go into Device Manger, go to properties of the device, then go to Details tab.
Under Property, choose Hardware Ids.
You should be able to search the second entry and find a driver...for example, my Realtek PCIE device string is: PCI\VEN_10EC&DEV_5229&SUBSYS_501817AA
With Asus devices like that, the driver is usually the ACPI driver in my experience. That might help you find what you need, though be careful where you download the drivers from a lot of semi or totally illegit sites will come up. Search more for forum posts and links directly to Asus.
A quick Google search of "Asus Z97 sm bus controller" came up with this link:
http://www.tomshardware.com/forum/329472-30-controller-installed
That might contain the answer and download for you.
