Dell OptiPlex 790 (Early 2011) - Manual (Page 21)

Memory
7
Removing the Memory
1. Follow the procedures in Before Working Inside Your Computer .
2. Remove the cover .
3. Remove the front bezel .
4. Remove the drive cage .
5. Release the memory-retention clips on each side of the memory modules.
6. Lift the memory modules out of the connectors on the system board.
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