HP PROBOOK 6550B CORE i5-M520 2.40GHZ 4GB RAM NO HD NO CADDIE | eBay
HP ProBook 6550b i5-M450 | 4GB RAM | Intel HD Graphics 1.5 | Built in Cam | Shopee Philippines
Arch Memory 4GB 204-Pin DDR3 1333 MHz So-dimm RAM for HP ProBook 6550b at Amazon.com
How to remove and install new memory (RAM) in a HP ProBook 6550B - YouTube
HP 6550b Memory upgrade.AVI - YouTube
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