8GB KIT (2 x 4GB) for HP-Compaq 600 Notebook Series HP 620 HP 625 HP 635. SO-DIMM DDR3 Non-ECC PC3-8500 1066MHz RAM Memory. Genuine A-Tech Brand. at Amazon.com
HP AM459A | 128GB SLC SSD Memory Module | HP 620-0072-00 - Serverworlds
4GB Stick for HP-Compaq 600 Notebook Series HP 620 HP 625 HP 635. SO-DIMM
Review HP 620 Notebook - NotebookCheck.net Reviews
Memory RAM | 8GB Kit (2x4GB) - HP - HPE Essential HP 620 - - 1333MHz, Unbuffered, 1,5V