Asus SABERTOOTH 990FX - Manual (Page 40)

2-22 Chapter 2: Hardware information
Chapter 2
2. JMicron ® JMB362 Serial ATA 3.0 Gb/s connectors (7-pin SATA3G_E1/E2 [black])
These connectors connect to Serial ATA 3.0 Gb/s hard disk drives and optical disc
drives via Serial ATA 3.0 Gb/s signal cables.
3. Serial port connector (10-1 pin COM1)
This connector is for a serial (COM) port. Connect the serial port module cable to this
connector, then install the module to a slot opening at the back of the system chassis.
The COM module is purchased separately.