Dell Dimension U7021 Owner's Manual page 78

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.
NOTICE:
while you apply equal force to each end of the module.
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.
78
Removing and Installing Parts
memory module
cutouts (2)
To avoid damage to the memory module, press the module straight down into the connector
memory connector
closest to processor
securing clips (2)
connector
notch
crossbar