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 remove and install new memory (RAM) in a HP ProBook 6550B - YouTube
Review HP ProBook 6550b Notebook - NotebookCheck.net Reviews
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 Intel core i5 @2.57ghz – HDD 320GB _ 4GB RAM Notebook PC – Wene Computers
8GB 2 X 4GB Memory for HP ProBook 6550b DDR3 PC3-10600 SODIMM RAM (PARTS-QUICK Brand) at Amazon.com
OFFTEK 4GB Replacement Memory RAM Upgrade for HP-Compaq ProBook 6550b (DDR3-10600) Laptop Memory at Amazon.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
RAM memory for HP ProBook 6550b
OFFTEK 2 GB Replacement RAM Memory for HP Compaq ProBook 6550b Laptop Memory: Amazon.de: Computer & Accessories