4GB (2 x 2GB) - 1333MHz DDR3-1333/PC3-10600 - Non-ECC. When you buy Crucial memory, you're buying directly from the largest DRAM manufacturer in America and one of the top three in the world. Crucial Technology is a division of Micron. We have more than 20 years of industry experience and are the lowest-cost, most efficient DRAM manufacturer, and many of the world's leading computer manufacturers use our memory. Crucial brings that same high-quality memory directly to you, the end consumer. CT2KIT25664BA1339 More details...