Samsung SCX-4720FN - Manual (Page 280)

C
I NSTALLING M ACHINE O PTIONS C.3
4 Remove the memory DIMM from its antistatic package.
Locate the alignment notches on the bottom edge of each
DIMM.
5 Holding the memory DIMM by the edges, align the notches
on the memory DIMM with the grooves at the top of the
memory DIMM slot.
6 Push the DIMM straight into the DIMM slot until it snaps into
place. Make sure the latches fit over the notches located on
either side of the DIMM.
Connection
points
Notches
Groove
Notch
Latch
Notch