The following illustration shows the locations of the parts on the system board.
Note: The system board might look slightly different from the illustration.
Figure 1. System board part locations
| 1 4-pin power connector | 2 Memory slot |
| 3 Memory slot | 4 Microprocessor fan connector |
| 5 Microprocessor | 6 Memory slot |
| 7 Memory slot | 8 Flex bay 1 fan connector |
| 9 Flex bay 2 fan connector | 10 Thermal sensor connector |
| 11 4-pin SATA power connector | 12 14-pin power connector |
| 13 4-pin SATA power connector | 14 M.2 solid-state drive slot 1 |
| 15 M.2 solid-state drive slot 2 | 16 VROC connector |
| 17 Front-fan connector | 18 Clear CMOS /Recovery jumper |
| 19 Coin-cell battery | 20 SATA 4 connector |
| 21 SATA 2 connector | 22 SATA 1 connector |
| 23 SATA 3 connector | 24 Thunderbolt™ control connector |
| 25 SATA 7 connector (eSATA connector) | 26 Front-bezel connector (for connecting LED indicators and the power button) |
| 27 USB 2.0 connector (for connecting the Wi-Fi connector or 9-in-1 card reader connector) | 28 Front USB 3.0 connector (for connecting USB connectors on the front panel) |
| 29 Internal USB 3.0 connector | 30 Storage-drive activity indicator connector |
| 31 Four-digit-diagnostics display connector | 32 Trusted Cryptography Module (TCM) connector |
| 33 Internal-speaker connector | 34 Front-audio connector |
| 35 PCIe x4 card slot | 36 PCIe x16 card slot |
| 37 PCIe x8 card slot | 38 PCIe x16 card slot (graphics card available on some models) |
| 39 Cover presence switch connector (intrusion switch connector) | 40 Rear-fan connector |
| 41 SATA Serial (COM) connector |