Sony PCV-LX810 - Manuel (Page 63)

System Board 49
Memory Module (DIMM) Connectors
Both sides of each Dual Inline Memory Module (DIMM) look very similar. The
side with pin 1 has a small "1" to the left of pin 1. Be sure to orient a DIMM
correctly in the DIMM connector (a small triangle on the connector indicates pin
1).
O N 1 2
DIMM1
DIMM2
{
1 1 1 1
Indicates pin 1
Memory module (DIMM)