MSI K9AG Neo2-Digital User Manual page 32

Hardware Setup
S/PDIF-Out Connector: JSPD1 (Optional, for HDMI graphics card
only)
This connector is used to connect S/PDIF (Sony & Philips Digital Interconnect Format)
interface for audio transmission to the HDMI graphics card.
JSPD1
VCC
SPDFO
GND
2-17