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Solved: HP Delphi D40/Probook 6550B - HP Support Community - 8632576
HP ProBook 6550b 15.6" Widescreen Laptop - with Intel i5-520M 2.4GHz, 4GB RAM, 128GB SSD Hard Drive - Windows 7 Professional 64 - Used with FREE 3 Year Warranty provided by CPS. - Walmart.com
How to Upgrade Memory on HP Probook 6455 Laptop - YouTube
HP ProBook 6550b Intel Core i5 M450 CPU @ 2.40GHz, 4GB RAM, 320GB HDD with Microsoft Windows 10 Professional and Microsoft Office 2010 Home & Business.
HP ProBook 6550b DDR3 12800Mhz SO-Dimm Laptop Ram in Pakistan – Laptop Spares
How to upgrade RAM memory in HP ProBook 6450b, 6455b laptop - YouTube
8GB 2 X 4GB Memory for HP ProBook 6550b DDR3 PC3-10600 SODIMM RAM (PARTS-QUICK Brand) at Amazon.com
HP ProBook 6550b 15.6" Widescreen Laptop - with Intel i5-520M 2.4GHz, 4GB RAM, 128GB SSD Hard Drive - Windows 7 Professional 64 - Used with FREE 3 Year Warranty provided by CPS. - Walmart.com
HP ProBook 6550b 15.6" Widescreen Laptop - with Intel i5-520M 2.4GHz, 4GB RAM, 128GB SSD Hard Drive - Windows 7 Professional 64 - Used with FREE 3 Year Warranty provided by CPS. - Walmart.com
8GB (4GBx2) Team High Performance Memory RAM Upgrade For HP - Compaq ProBook 4311s 5220m 6550b 6555b Laptop. The Memory Kit comes with Life Time Warranty. at Amazon.com