Included in the package is a Genuine A-Tech Brand 2GB Single DDR2 PC2-6400 / PC2-800 1.8v NON-ECC DESKTOP Memory Module (240-pin DIMM 800MHz) upgrade. The A-Tech CT25664AA800-ATC is equivalent to the Crucial CT25664AA800 and serves as a compatible replacement for or expansion of existing OEM installed modules. A-Tech is one of the most trusted names in Premium Memory. Backed by a Lifetime Warranty and 5 star customer support, A-Tech has you covered! Memory upgrades have never been easier. Designed specifically to help your computer run faster and smoother, an A-Tech memory upgrade is one of the fastest, most affordable, and easiest ways to improve your system’s performance.