(SO-DIMM) A smaller kind of DIMM with 72 pins (supporting 32-Bit transfers) or 144 pins (64-Bit transfers). Regular DIMMs have 168 pins and support 64-Bit transfers. Being roughly half the size of the regular DIMM, SO-DIMMs are often used in notebook computers. {Kingston Memory Guide (http://www.kingston.com/tools/umg/newumg05a.asp)}. (2001-02-16)