Dell Inspiron 8600 Owner's Manual page 79

8 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.
b
securing clips
(2 per connector)
NOTICE:
If you need to install memory modules in two connectors, install a memory module in the
connector labeled "DIMM A" before you install a module in the connector labeled "DIMM B." Insert
memory modules at a 45-degree angle to avoid damaging the connector.
memory module
Adding and Replacing Parts
79