The interface is "integrated on the motherboard".
Foxconn G33Mxx Motherboard Audio Driver
The audio controller for this motherboard is the Realtek® ALC888 (HDA).
File: HDA-1.95.zip (for G33M02 board)
Description: Realtek HDA Audio Driver
File name: HDA-1.95.zip
File size: 41.5MB (43,584,924 bytes)