This is the type of memory that the computer is designed to work with. It includes specifications such as DDR, DDR2 and so forth. These memory technologies are usually not compatible with one another, so selecting the appropriate type is necessary. Newer technologies generally allow for faster memory and smoother operation.

Smaller computers sometimes use Flash memory—such as microSD—which brings the size of the entire device down considerably. A smartphone that uses this technology, for instance, may be able to hold several gigabytes of data in a pocket-sized package.