Memory Module (Dimm) Slots - Sony PCV-RX540 - Vaio Desktop Computer System Reference Manual

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VAIO Digital Studio System Reference Manual

Memory Module (DIMM) Slots

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 slot (a small triangle on the slot
indicates pin 1).
Memory module (DIMM)
1 1 1 1
Indicates pin 1