Sony PCV-RXP-RZP - Manual (Page 54)

VAIO Digital Studio System Reference Manual 40
6 Align the module over the appropriate socket, noting the location of
pin 1 on the module and pin 1 on the socket.
7
Carefully but firmly insert the edge of the module into the socket.
Press down
here
Handles
Pin 1 side
DDR-DIMM 2
Memory module (DDR-DIMM)
Indicates pin 1
1 1 1 1
DDR-DIMM 1