Memory Module (Ddr-Dimm) Slots - Sony PCV-RX750 System Reference Manual

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VAIO Digital Studio System Reference Manual

Memory Module (DDR-DIMM) Slots

Memory module (DDR-DIMM)
1 1 1 1
Indicates pin 1
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.