NeweggBusiness - HP Laptop ProBook Intel Core i7 620M (2.66GHz) 4GB Memory 500GB HDD AMD Radeon HD 6370M 17.3" Windows 7 Professional 64-bit 4720s (XT949UT#ABA)
HP ProBook 4720s disassembly video and photo guide
Memory RAM Upgrade for HP ProBook 4720s 4GB DDR3 SODIMM | eBay
HP ProBook 4520S 4720S 628794-001 Motherboard 48.4GK06.041 H9265-4
CMS 8GB (2X4GB) DDR3 10600 1333MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with HP/Compaq® Probook 4720S, 4520S Notebook - A29 at Amazon.com
A-Tech 8GB (2 x 4GB) RAM for HP PROBOOK 4720S | DDR3 1333MHz SODIMM PC3-10600 204-Pin Non-ECC Memory Upgrade Kit: Buy Online at Best Price in UAE - Amazon.ae
Buy HP Probook 4520s 4720s Laptop Notebook Motherboard Intel 628795-001 Online in India at Lowest Prices - Price in India - buysnip.com