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4GB RAM Memory for Lenovo ThinkPad W510 4319 Black Diamond Memory Module DDR3 SO-DIMM 204pin PC3-8500 1066MHz Upgrade - Walmart.com
OFFTEK 2GB Replacement Memory RAM Upgrade for IBM-Lenovo ThinkPad W510 (4391-xxx) (DDR3-8500) Laptop Memory at Amazon.com
8GB (4GBx2) Team High Performance Memory RAM Upgrade For Lenovo ThinkPad W510 Series W700 Series Laptop. The Memory Kit comes with Life Time Warranty. at Amazon.com