ASROCK B550 Phantom Gaming 4 Manual page 5

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)
4