Adamanta 8GB (1x8GB) Memory Upgrade for HP Pavilion Desktop 550-a114 DDR3L 1600Mhz PC3L-12800 UDIMM 2Rx8 CL11 1.35v RAM at Amazon.com
1GB Team High Performance Memory RAM Upgrade Single Stick For HP - Compaq Business Notebook 550 (Intel Celeron M) Laptop. The Memory Kit comes with Life Time Warranty. at Amazon.com
HP 550 Notebook RAM memory replacement - iFixit Repair Guide
Review HP 550 Notebook - NotebookCheck.net Reviews