Dell INSPIRON Inspiron 9100 Owner's Manual page 104

3
If you are replacing a memory module, remove the existing module:
Use your fingertips to carefully spread apart the securing clips on each end of the memory
a
module connector until the module pops up.
Remove the module from the connector at a 45-degree angle.
b
NOTICE:
capacity. Insert memory modules at a 45-degree angle to avoid damaging the connector.
104
Adding and Replacing Parts
Make sure that memory modules are installed in both connectors and that they are of the same
memory module
securing clips (2 per connector)