Arch Memory 2 GB (1 x 2 GB) 240-Pin DDR2 UDIMM for Dell OptiPlex 330 RAM Arch Memory is a Registered Trademark of Arch Computer, LLC 1 x 2GB DDR2-800 PC2-6400U 240-Pin UDIMM CL6 Dual Rank (2Rx8) Non-ECC Unbuffered 800MHz Lifetime Replacement Warranty Included