Sony pcv-rx780g Guide D’Exploitation

Align pin 1 of the Dual Inline Memory Module (DDR-DIMM)  to the 
small triangle located on the memory module slot of the system board.

DDR-DIMM1

DDR-DIMM2

DDR-DIMM3

Indicates pin 1

Memory module (DDR-DIMM)

1

1

1

1