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Dell Vostro 2420 Ram replacement and upgrade - YouTube
Dell Vostro 2520 Owner's Manual
OFFTEK 4GB Replacement Memory RAM Upgrade for Dell Vostro 2520 (DDR3-12800) Laptop Memory at Amazon.com
OFFTEK 4GB Replacement Memory RAM Upgrade for Dell Vostro 2520 (DDR3-12800) Laptop Memory at Amazon.com