Solved: upgrade the processor of HP notebook 620 - HP Support Community - 6677021
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
OFFTEK 1GB Replacement Memory RAM Upgrade for HP-Compaq HP 620 (DDR3-10600) Laptop Memory at Amazon.com
Laptop HP 620 | tonymacx86.com
HP 15.6" Refurbished 1280 x 720 Intel 7th Gen Core i5-7200U with 16GB RAM Intel HD Graphics 620 256GB SSD Silver 850 G4 - Best Buy
HP 620 Intel Core 2 Duo T6570 2.10GHz/4GB RAM/500GB HDD/14" Win 11 Pro | eBay