Sony VAIO PCV-RX740 Reference Manual page 50

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VAIO Computer System Reference Manual
7
Align the module over the appropriate slot, noting the location of pin
1 on the module and pin 1 on the slot.
1 1 1 1
Indicates pin 1
8
Carefully but firmly insert the edge of the module into the slot.
Memory module (DDR-DIMM)
Pin 1 side
DDR-DIMM 2
DDR-DIMM 1
Press down
here
Handles