Acer Aspire X1420G Acer Aspire X1400 and X1420 Desktop Series Service Guide - Page 80

Header Name Function ATX12V CONN Definition 1: GND 2: GND 3: +12V_4P 4: +12V_4P Connecting Optional Devices Refer to the following for information on connecting the main board's optional devices: SATA1~2: Serial ATA connectors These connectors are used to support the new Serial ATA devices for the highest datatransfer rates  (3.0 Gb/s), simpler disk drive cabling and easier PC assembly. It elimi-nates limitations of the current Parallel ATA interface. But maintains register com-patibility and software compatibility with Parallel ATA. Pin Signal Name 1 Ground 3 TX- 5 RX- 7 Ground Pin Signal Name 2 TX+ 4 Ground 6 RX+ 72 Aspire AX1400 Service Guide