Dell OptiPlex Small Form Factor 7020 Owner's Manual page 104

4. UDIMM slots
From the left (a>b):
DIMM1
DIMM2
5. M.2 2230/2280 solid-state drive slot (M.2 PCIe SSD-0)
6. Power-button connector (PWR SW)
7. System-power connector (ATX SYS)
8. M.2 WLAN slot (M.2 WLAN)
9. Hard-drive data connector (SATA-0)
10. Optical-drive/hard-drive data connector (SATA-3)
11. SATA power connector (SATA PWR)
12. Internal-speaker connector (INT SPKR)
13. PCIe x16 slot (SLOT2)
14. PCIe x1 slot (SLOT1)
15. Coin-cell battery socket (RTC)
16. Processor socket (CPU)
17. Optional video connector (VIDEO)
18. Serial/PS2 module connector (KB MS SERIAL)
The following images indicate the location of the system board and provide a visual representation of the removal procedure.
Figure 57. Removing the system board
Steps
1. Remove the screw (#6-32) that secures the front I/O bracket to the chassis.
2. Rotate and remove the front I/O-bracket from the chassis.
104 Removing and installing Field Replaceable Units (FRUs)
Restricted - Confidential