Dell Dimension 4500C Owner's Manual page 91

Align the notch on the bottom of the module with the crossbar in the
9
connector.
memory module
cutouts (2)
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.
Insert the module into the connector until the module snaps into
10
position.
If you insert the module correctly, the securing clips snap into the
cutouts at each end of the module.
memory connector closest
to microprocessor
securing clips (2)
connector
notch
crossbar
91
Adding Pa rts