1. A dual in-line memory module (DIMM) comprising: a rectangular printed circuit board having a first side and a second side, a length of between 149 and 153 millimeters and first and second ends having a width smaller than said length; a first plurality of connector locations on said first side extending along a first edge of said board that extends the length of the board; a second plurality of connector locations on said second side extending on said first edge of said board; a locating key having its center positioned on said first edge and located between 82 mm and 86 mm from said first end of said card and located between 66 and 70 mm from said second end of said card.