ASRock B450M/ac R2.0 User Manual - Page 37
AMD LED Fan USB
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B450M/ac R2.0 Power LED and Speaker Header (7-pin SPK_PLED1) (see p.7, No. 14) Serial ATA3 Connectors (SATA3_1: see p.7, No. 12)(Upper) (SATA3_2: see p.7, No. 11)(Lower) (SATA3_3: see p.7, No. 9)(Upper) (SATA3_4: see p.7, No. 10)(Lower) AMD LED Fan USB Header (4-pin USB_7) (see p.7, No. 8) USB 2.0 Headers (9-pin USB_3_4) (see p.7, No. 17) (9-pin USB_5_6) (see p.7, No. 18) SPEAKER DUMMY DUMMY +5V 1 PLED+ PLED+ PLED- Please connect the chassis power LED and the chassis speaker to this header. These four SATA3 connectors support SATA data cables for internal storage devices with up to 6.0 Gb/s data transfer rate. SATA3_1 SATA3_3 SATA3_2 SATA3_4 GND P+ PUSB_PWR 1 This header is used for connecting the USB connector on the AMD SR3 Heatsink. USB_PWR PP+ GND DUMMY 1 GND P+ PUSB_PWR There are two headers on this motherboard. Each USB 2.0 header can support two ports. English 31