Our ranges of DDR2 SO-DIMM memory modules are manufactured by OCZ, A-Data, Patriot, & G.Skill and are available as a single or dual channel kit. This type of memory upgrade is designed for new laptop or notebook computers, as the majority of new laptops released today use DDR2 memory. The DDR2 SO-DIMM upgrade modules have 200 pins and are available in 512MB, 1GB, 2GB, 4GB & 8GB capacities, 533MHz, 667MHz, & 800MHz memory speeds, and CL3, CL4 & CL5 latencies. The standards available in this DDR2 computer memory upgrade category are: PC2-4200, PC2-5300/PC2-5400, & PC2-6400. DDR2 SO-DIMM memory is generally suitable across most systems that are designed for DDR2 laptop memory but it is always recommend checking the system user manual for compatibility information. We also stock a range of DDR2 modules designed especially for Apple Mac systems.