Asus RS500-E9 Series User Manual page 72

12. VGA connector (10-1 pin VGA_HDR1)
This connector supports the VGA High Dynamic-Range interface.
13. 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.
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Chapter 4: Motherboard Information