Memory is sold in single chips or kits containing 2 chips of identical size. Purchase as little as a single 128 MB chip or as much as a 1 GB kit. The SO-DIMM chips are specially sized to fit in laptops. SO-DIMM is a type of shortened memory chip. It is half the size of traditional DIMMs, but has similar performance and capacity. For a selection of available memory for your system, choose a model number from below.