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4GB (1X4GB) Memory Ram Compatible with Hp Probook 6450B (Ddr3) By CMS A34 - Computer Memory Solutions
Refurbished: HP Laptop ProBook Intel Core i5 1st Gen 520M (2.40GHz) 4GB Memory 320GB HDD Intel HD Graphics 14.0" Windows 10 Pro 64-Bit 6450B Laptops / Notebooks - Newegg.com
HP ProBook 6450b, Intel Core i5-1st GEN M 2.40GHZ, 4GB RAM, 500GB HDD | eBay
HP ProBook 6450b 14" Laptop Core i3 For Parts/Repair No Keyboard/HDD/ RAM JR | eBay