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4GB DDR3-1333 RAM Memory Upgrade for The Compaq HP Probook 6450b (WZ233UT#ABA) (Genuine A-Tech Brand) at Amazon.com
Amazon.com: HP PROBOOK 6455B,PHENOM N620 CPU,14.0 HD AG LED SVA, UMA, WEBCAM, 4GB DDR3 RAM, : Electronics
HP ProBook 6450b 14 Inch Business Laptop, Intel Core i5-520M 2.4GHz, 4G DDR3, 500G, DVD, WiFi, VGA, Display Port, Windows 10 Pro 64 Bit-Multi-Language Supports English/French/Spanish (Renewed) : Electronics - Amazon.com
HP ProBook 6450b 14.0" Silver Used Laptop - Intel Core i5 540M 1st Gen 2.53 GHz 4GB SODIMM DDR3 SATA 2.5" 250GB HDD DVD-RW Windows 10 Home 64-Bit - Walmart.com