We offer single, dual, and quad DDR2 memory kits, available at 512MB, 1GB, 2GB, 4GB, 8GB, & 16GB capacity. The DDR2 memory modules, ranging from 533MHz to 1300MHz are manufactured by Adata, Advance, Aeneon, CellShock, G.Skill, GeIL, Mushkin, OCZ, Patriot, Team, and Transcend.