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OFFTEK 8GB Replacement Memory RAM Upgrade for HP-Compaq ProBook 4540s (DDR3-10600) Laptop Memory at Amazon.com
A-Tech 8GB Module for HP ProBook 4540s Laptop & Notebook Compatible DDR3/DDR3L PC3-12800 1600Mhz Memory Ram (ATMS322399B12351X1) at Amazon.com
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CMS 16GB (2X8GB) DDR3 10600 1333MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with HP/Compaq® Probook 4545S 1333Mhz - A13 at Amazon.com
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Seifelden 4GB (2X2GB) Memory RAM for HP ProBook 4540s Laptop Memory Upgrade - Walmart.com
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Arch Memory 8GB 204-Pin DDR3 1600 MHz So-dimm RAM for HP ProBook 4540s at Amazon.com
8GB (1X8GB) Memory RAM for HP/Compaq ProBook 4540s, ProBook 4545s 1333MHZ A14 | eBay
