Definition: LPX motherboard

(Low-Profile EXtended motherboard) A low-profile PC motherboard for slimline cases, introduced in 1987 by Western Digital. Unlike boards for desktop and tower cases that hold the expansion cards perpendicular to the board, cards plug into a riser card on the LPX that makes them parallel with the board. Having a 9" width, the Mini LPX version decreased the size from 9x13 to 9x11 inches. See PC motherboards.