Dell 1600n Owner's Manual page 87

Open the lever on each side of the DIMM slots completely.
3
Remove the memory DIMM from the antistatic package. Locate the alignment
4
notches on the bottom edge of the DIMM.
Connection
points
NOTE: Avoid touching the connection points along the edge of the memory.
Hold the memory DIMM. Align the notches on the DIMM with the notches at the
5
top of the DIMM slot.
Notches
Installing Options
7 7