Dell Alienware Aurora R16 Owner's Manual page 92

3. SATA 6 Gbps drive connector (HDD1)
5. Power-supply connector (ATX1)
7. Solid-state drive slot (M.2 PCIe SSD-1)
9. Memory-module slot, DIMM2
11. PCI-Express x16 mechanical/x16 electrical slot (SLOT1)
13. PCI-Express x4 slot (SLOT2)
15. Rear-chassis fan LED connector (LED FAN SYS1)
17. Liquid-cooling pump LED connector
19. Power-supply connector (ATX3)
21. Air-cooling fan connector (FAN CPU)
23. SATA power connector (SATA PWR)
25.Front I/O-panel cable
The following images indicate the location of the system board and provide a visual representation of the removal procedure.
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4. SATA 6 Gbps drive connector (HDD2)
6. Solid-state drive slot (M.2 PCIe SSD-2)
8. Memory-module slot, DIMM1
10. CPU socket
12. PCI-Express x4 slot (SLOT3)
14. Rear-chassis fan connector (FAN SYS1)
16. Liquid cooling pump fan connector (FAN PUMP)
18. Top-chassis fan connector one (FAN_SYS4)
20.Power-supply connector (ATX2)
22. Top-chassis fan connector two (FAN_SYS5)
24.Wireless-card slot