ASRock B450 Pro4 Quick Installation Guide - Page 31
Power LED and Speaker
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SATA3_1 SATA3_4 SATA3_3 SATA3_A2 SATA3_A1 SATA3_2 English B450 Pro4 Power LED and Speaker Header (7-pin SPK_PLED1) (see p.1, No. 15) Serial ATA3 Connectors (SATA3_1: see p.1, No. 9) (SATA3_2: see p.1, No. 8) (SATA3_3: see p.1, No. 13) (SATA3_4: see p.1, No. 14) (SATA3_A1: see p.1, No. 11) (SATA3_A2: see p.1, No. 12) SPEAKER DUMMY DUMMY +5V 1 PLED+ PLED+ PLED- Please connect the chassis power LED and the chassis speaker to this header. These six SATA3 connectors support SATA data cables for internal storage devices with up to 6.0 Gb/s data transfer rate. * M2_2, SATA3_3 and SATA3_4 share lanes. If either one of them is in use, the others will be disabled. * To minimize the boot time, use AMD SATA ports (SATA3_1~4) for your bootable devices. USB 2.0 Headers (9-pin USB_1_2) (see p.1, No. 22) (9-pin USB_3_4) (see p.1, No. 21) 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. USB 3.1 Gen1 Header (19-pin USB3_5_6) (see p.1, No. 7) Vbus IntA_PA_SSRXIntA_PA_SSRX+ GND IntA_PA_SSTXIntA_PA_SSTX+ GND IntA_PA_DIntA_PA_D+ Vbus IntA_PB_SSRXIntA_PB_SSRX+ GND IntA_PB_SSTXIntA_PB_SSTX+ GND IntA_PB_DIntA_PB_D+ Dummy 1 There is one header on this motherboard. Each USB 3.1 Gen1 header can support two ports. 29