4GB 2X2GB RAM Memory for Compaq HP Business Notebooks Business Notebook 6730b Black Diamond Memory Module DDR2 SO-DIMM 200pin PC2-6400 800MHz Upgrade - Walmart.com
How to replace Battery, RAM, HDD and Thermal Paste in the HP Compaq 6720s laptop - YouTube
A-Tech 4GB KIT 2 x 2GB for HP Compaq 6000 Notebook HP 6250s 6510b 6515b 6515s 6520s 6530b 6710b 6710s 6715b 6715s 6716s 6720s 6735s 6820s 6910p 7132s SO-DIMM DDR2 PC2-5300 667MHz