9. Optical drive audio connector (4-pin CD)
This connector is for the 4-pin audio cable that connects to the audio
connector at the back of the optical drive.
Enable the CD-IN function in the audio utility when using this
connector.
10. USB connectors (10-1 pin USB56, USB78)
These connectors are for USB 2.0 ports. Connect the optional USB module
cable to any of these connectors, then install the module to a slot opening at
the back of the system chassis. These USB connectors comply with USB 2.0
specication that supports up to 480 Mbps connection speed.