ASROCK B450M PRO4 R2.0 User Manual page 27

B450M Pro4 R2.0
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4-pin FAN cable
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USB 2.0 Header
Please note that this connector is the interface to the LED control board on the SR3, it requires the AMD
utility "SR3 Settings Software" to control the LED.
*The diagram shown here are for reference only. Please refer to page 29 for the orientation of USB Header.
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