8GB Kit [2x4GB] RAM Memory Upgrade for the Compaq HP Probook 6550b | eBay
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
Solved: HP Delphi D40/Probook 6550B - HP Support Community - 8632576
HP ProBook 6550b / 4GB RAM, 500GB HDD IntelCore i5, 2.5GHz, 15.5" / windows 10 / GRADE: A | Baudspace Warehouse
HP ProBook 6550b / 4GB RAM, 500GB HDD IntelCore i5, 2.5GHz, 15.5" / windows 10 / GRADE: A | Baudspace Warehouse
OFFTEK 4GB Replacement Memory RAM Upgrade for HP-Compaq ProBook 6550b (DDR3-10600) Laptop Memory at Amazon.com
Hp probook 6550B Intel core i5 @2.57ghz – HDD 320GB _ 4GB RAM Notebook PC – Wene Computers