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This is stock RAM removed from a laptop after an upgrade.
SK Hynix 4GB 1RX8 Ddr4 2133 MHz (PC4-2133P) 260 Pin SODIMM Memory Module
$8.00
HP Hynix 4GB DDR3L 1600MHZ SO-DIMM for HP EliteBook Folio 1040 G1 G2
$32.99
Lot Hynix Kits 4GB 2RX4 PC2-5300F DDR2 667MHZ ECC FB-DIMM Server Memory RAM #GS
$63.23
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