4GB (1x4GB) RAM Memory 4 HP/Compaq TouchSmart 320-1030, 520-1020 ALL IN ONE A30 849005035293 | eBay
Ram memory 4GB (1 x 4GB) DDR3 PC3-12800,1600MHz, 204 PIN SODIMM for laptops at Amazon.com
Bewinner 1PCS Memory RAM DDR2 4GB, 4GB Large Capacity DDR2 800Mhz Memory Module,Designed for AMD,Adopting 240Pin to Achieve High Anti-Interference and Antistatic Properties,Plug and Play
SK Hynix 4GB DDR4 3200MHz PC4-25600 1.2V 1R x 16 SODIMM Laptop RAM Memory