SO-DIMMs are a smaller alternative to a DIMM, being roughly half the size of regular DIMMs. SO-DIMMS are often used in systems which have space restrictions such as notebooks, small footprint PCs (such as those with a Mini-ITX motherboard), high-end upgradable office printers, and networking hardware like routers.
These modules are SODIMM DDR1 ( first generation of DDR memory ) with 200 pins and have a single notch nearer to one side.
We only select and sale brand new "premium" memory