ASROCK X99 WS User Manual page 13

No. Description
1 2 x 284-pin DDR4 DIMM Slots (DDR4_A1, DDR4_B1)
2 2 x 284-pin DDR4 DIMM Slots (DDR4_A2, DDR4_B2)
3 ATX 12V Power Connector (ATX12V1)
4 2 x 284-pin DDR4 DIMM Slots (DDR4_D2, DDR4_C2)
5 2 x 284-pin DDR4 DIMM Slots (DDR4_D1, DDR4_C1)
6 CPU Fan Connector (CPU_FAN1)
7 CPU Fan Connector (CPU_FAN2)
8 ATX Power Connector (ATXPWR1)
9 USB 3.0 Header (USB3_5_6)
10 Chassis Fan Connector (CHA_FAN3)
11 HDD Saver Connector (SATA_PWR_1)
12 SATA3 Connectors (S_SATA3_0_1)
13 SATA3 Connectors (S_SATA3_2_3)
14 SATA3 Connectors (SATA3_4_5)
15 SATA3 Connectors (SATA3_2_3)
16 SATA3 Connectors (SATA3_0_1)
17 BIOS Selection Switch (BIOS_SEL1)
18 System Panel Header (PANEL1)
19 Power LED Header (PLED1)
20 Power Switch (PWRBTN1)
21 Reset Switch (RSTBTN1)
22 Chassis Speaker Header (SPEAKER1)
23 Chassis Fan Connector (CHA_FAN2)
24 Chassis Fan Connector (CHA_FAN1)
25 Clear CMOS Jumper (CLRCMOS1)
26 TPM Header (TPMS1)
27 USB 2.0 Header (USB7_8)
28 USB 2.0 Header (USB5_6)
29 COM Port Header (COM2)
30 COM Port Header (COM1)
31 PCIe Power Connector (PCIE_PWR2)
32 Front Panel Audio Header (HD_AUDIO1)
33 hunderbolt AIC Connector (TBT1)
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