2GB Memory RAM Upgrade for the Compaq HP Probook 4310s 4415s 4510s 4710s Laptops | eBay
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OFFTEK 1GB Replacement Memory RAM Upgrade for HP-Compaq ProBook 4310s (Intel GL40 Chipset) (DDR3-10600) Laptop Memory at Amazon.com
2GB Team High Performance Memory RAM Upgrade Single Stick For HP - Compaq ProBook 4310s (Intel GL40 Chipset) 4310s (Intel PM/GM45 Chipsets) Laptop. The Memory Kit comes with Life Time Warranty. -
CMS 4GB (1X4GB) DDR3 10600 1333MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with HP/Compaq® Probook 4210S, 4230S, 4310S, 4320S, 4321S - A30 at Amazon.com