Dell Dimension 5100C - Manual (Page 65)

Removing and Installing Parts
65
4 Align the notch on the bottom of the module with the crossbar in the connector.
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.
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.
securing clips (2)
connector
memory connector
closest to processor
notch
memory module
cutouts (2)
crossbar