Dell Precision 3660 Tower Service Manual page 79

19. SATA 0 connector
21. M.2 PCIe SSD slot
23. PCIe x4 connector
25. M.2 PCIe SSD slot
27. System fan connector
29. Type-C connector
31. Video card connector
The following images indicate the location of the system board and provide a visual representation of the installation procedure.
20. ATX system power connector
22. Thunderbolt connector
24. PCIe x16 connector
26. PCIe x4 connector
28. CPU fan connector
30. Liquid cooler connector
32. LAN connector
Removing and installing components 79