ASUS P9D-C Series
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17. VGA connector (16-1 pin VGA_HDR1)
This connector supports the VGA High Dynamic-Range interface.
18. Hard disk activity LED connector (4-pin HDLED1)
This LED connector is for the storage add-on card cable connected to the SATA or SAS
add-on card. The read or write activities of any device connected to the SATA or SAS
add-on card causes the front panel LED to light up.