ASRock B550 Pro4 User Manual - Page 14
x 288-pin DDR4 DIMM Slots DDR4_A1, DDR4_B1
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No. Description 1 CPU Fan / Waterpump Fan Connector (CPU_FAN2/WP) 2 ATX 12V Power Connector (ATX12V1) 3 ATX 12V Power Connector (ATX12V2) 4 CPU Fan Connector (CPU_FAN1) 5 2 x 288-pin DDR4 DIMM Slots (DDR4_A1, DDR4_B1) 6 2 x 288-pin DDR4 DIMM Slots (DDR4_A2, DDR4_B2) 7 RGB LED Header (RGB_LED2) 8 Addressable LED Header (ADDR_LED2) 9 ATX Power Connector (ATXPWR1) 10 USB 3.2 Gen1 Header (USB3_7_8) 11 SPI TPM Header (SPI_TPM_J1) 12 SATA3 Connector (SATA3_5) 13 SATA3 Connector (SATA3_6) 14 SATA3 Connector (SATA3_3) 15 SATA3 Connector (SATA3_4) 16 SATA3 Connector (SATA3_1) 17 SATA3 Connector (SATA3_2) 18 Post Status Checker (PSC) 19 System Panel Header (PANEL1) 20 Power LED and Speaker Header (SPK_PLED1) 21 Chassis Fan / Waterpump Fan Connector (CHA_FAN1/WP) 22 Clear CMOS Jumper (CLRCMOS1) 23 USB 2.0 Header (USB_3_4) 24 USB 2.0 Header (USB_1_2) 25 Chassis Fan / Waterpump Fan Connector (CHA_FAN2/WP) 26 Chassis Fan / Waterpump Fan Connector (CHA_FAN4/WP) 27 Addressable LED Header (ADDR_LED1) 28 RGB LED Header (RGB_LED1) 29 COM Port Header (COM1) 30 Front Panel Audio Header (HD_AUDIO1) 31 Chassis Fan / Waterpump Fan Connector (CHA_FAN3/WP) 8 English