ASROCK AB350 Pro4, Manual

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No. Description
1 ATX 12V Power Connector (ATX12V1)
2 CPU Fan Connector (CPU_FAN1)
3 2 x 288-pin DDR4 DIMM Slots (DDR4_A1, DDR4_B1)
4 2 x 288-pin DDR4 DIMM Slots (DDR4_A2, DDR4_B2)
5 AMD Fan LED Header (AMD_FAN_LED1)
6 RGB LED Header (RGB_HEADER1)
7 ATX Power Connector (ATXPWR1)
8 USB 3.0 Header (USB3_5_6)
9 SATA3 Connector (SATA3_2)
10 SATA3 Connector (SATA3_1)
11 SATA3 Connector (SATA3_A1)
12 SATA3 Connector (SATA3_A2)
13 SATA3 Connector (SATA3_3)
14 SATA3 Connector (SATA3_4)
15 Power LED and Speaker Header (SPK_PLED1)
16 System Panel Header (PANEL1)
17 Chassis Fan Connector (CHA_FAN2)
18 Chassis Fan Connector (CHA_FAN1)
19 Clear CMOS Jumper (CLRCMOS1)
20 USB 2.0 Header (USB_3_4)
21 USB 2.0 Header (USB_1_2)
22 COM Port Header (COM1)
23 TPM Header (TPMS1)
24 Front Panel Audio Header (HD_AUDIO1)
25 Chassis Fan Connector (CHA_FAN3)