4GB Total memory using 2pc of 2gb DDR3 PC2-12800 CL11 = Unbuffered = NON-ECC = DDR2-1600 = 1.5V = 256Meg x 64 = Genuine CMS brand, CMS is one of the most trusted names in the Computer Memory industry and this product carries a Lifetime Warranty from
CMS Expansion: 2 Sockets Max Memory 4GB Compatible with Dell Vostro 230 Mini Tower