HP VH641AT 4-GB DDR3 RAM (PC3-10600 , 1333 MHz) at Amazon.com
DDR SDRAM - Wikipedia
The difference between DDR3 and DDR4 | PC Gamer
DDR3 SDRAM - Wikipedia
G.SKILL Releases The World's Fastest DDR3 32GB (8GBx4) Memory at 3000MHz Extreme Speed Designed for 4th Gen Intel Core Processors and Z87 Motherboards - G.SKILL International Enterprise Co., Ltd.