Sony PCV-RX640 System Reference Manual - Page 62

Memory Module (DDR-DIMM) Slots, Both sides of each Double-data rate, Dual Inline Memory Module

Page 62 highlights

DDR-DIMM1 DDR-DIMM2 50 VAIO Digital Studio System Reference Manual Memory Module (DDR-DIMM) Slots Both sides of each Double-data rate, Dual Inline Memory Module (DDR-DIMM) look very similar. The side with pin 1 has a small "1" to the left of pin 1. Be sure to orient the memory module correctly in the DDR-DIMM slot (a small triangle on the slot indicates pin 1). Memory module (DDR-DIMM) 1 Indicates pin 1

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VAIO Digital Studio System Reference Manual
50
Memory Module (DDR-DIMM) Slots
Both sides of each Double-data rate, Dual Inline Memory Module
(DDR-DIMM) look very similar. The side with pin 1 has a small "1" to the
left of pin 1. Be sure to orient the memory module correctly in the
DDR-DIMM slot (a small triangle on the slot indicates pin 1).
DDR-DIMM1
DDR-DIMM2
Indicates pin 1
Memory module (DDR-DIMM)
1