Dell OptiPlex 755 - Manual (Page 100)

64-bit operating system, your computer will support a maximum of 8 GB (2-GB DIMMs in each of the four slots) of memory.
Installing Memory
1. Follow the procedures in Before You Begin .
2. Remove the computer cover (see "Removing the Computer Cover" for your specific computer).
3. Press out the securing clip at each end of the memory module connector.
4. Align the notch on the bottom of the module with the crossbar in the connector.
5. Insert the module into the connector until the module snaps into position.
If you insert the module correctly, the securing clips snap into the cutouts at each end of the module.
6. Replace the computer cover (see Replacing the Computer Cover ).
7. Connect your computer and devices to electrical outlets, and turn them on.
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.
NOTICE: To avoid electrostatic discharge and damage to internal components, ground yourself by using a wrist grounding strap or by periodically
touching an unpainted metal surface on the computer chassis.
1 memory connector closest to processor 2 securing clips (2) 3 memory connector
1 cutouts (2) 2 memory module 3 notch
4 crossbar
NOTICE: To avoid damage to the memory module, press the module straight down into the connector while you apply equal force to each end of the
module.
NOTICE: To connect a network cable, first plug the cable into the network port or device and then plug it into the computer.