Memory RAM Upgrade for HP ProBook 6550b 4GB DDR3 SODIMM | eBay
RAM memory for HP ProBook 6550b
New Ddr3 Memory Ram Pc3-10600 For Hp Probook 6440b 6450b 6455b 6460b 6465b 6540b 6550b 6555b - Rams - AliExpress
HP ProBook 6550b 15" Laptop 2.40Ghz i5-M450 4GB RAM NO HD ,NO CADDIE ,NO OS | eBay
HP ProBook 6550b 15.6" Widescreen Laptop - with Intel i5-520M 2.4GHz, 4GB RAM, 128GB SSD Hard Drive - Windows 7 Professional 64-REFURBISHED | Walmart Canada