TYAN S8812 User Manual page 21

JP21/JP22/JP25/JP26: DDR3 VDDIO Voltage Select Jumper
JP27: ID LED Connector
1
Open: Support regular 1.5V DDR3 memory (Default)
Closed: Support for Low Voltage 1.35V DDR3 memory
Pin
1
2
21
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Signal
ID LED+
GND