ASRock Z270 Pro4 Quick Installation Guide - Page 23
Power LED and Speaker
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Z270 Pro4 Power LED and Speaker Header (7-pin SPK_PLED1) (see p.1, No. 15) SPEAKER DUMMY DUMMY +5V 1 PLED+ PLED+ PLED- Please connect the chassis power LED and the chassis speaker to this header. Serial ATA3 Connectors (SATA3_0: see p.1, No. 13) (SATA3_1: see p.1, No. 12) (SATA3_2: see p.1, No. 11) (SATA3_3: see p.1, No. 10) (SATA3_4: see p.1, No. 9) (SATA3_5: see p.1, No. 8) SATA_0 SATA_2 SATA_4 SATA_1 SATA_3 SATA_5 These six SATA3 connectors support SATA data cables for internal storage devices with up to 6.0 Gb/s data transfer rate. * If M2_1 is occupied by a SATAtype M.2 device, SATA3_5 will be disabled. * If M2_2 is occupied by a SATAtype M.2 device, SATA3_0 will be disabled. USB 2.0 Headers (9-pin USB_3_4) (see p.1, No. 18) (9-pin USB_5_6) (see p.1, No. 19) USB_PWR PP+ GND DUMMY 1 GND P+ PUSB_PWR There are two USB 2.0 headers on this motherboard. Each USB 2.0 header can support two ports. USB 2.0 Header (4-pin USB_7) (see p.1, No. 20) 1 GND P+ PUSB_PWR There is one USB 2.0 header on this motherboard. Each header can support one port. English 21