A motherboard form factor
used in some desktop model
PCs. The distinguishing characteristic of LPX is that expansion boards
are inserted into a riser
that contains several slots. So the expansion boards are parallel to the motherboard rather than perpendicular to it as in other common form factors, such as AT and ATX
. The LPX design allows for smaller cases, but the number of expansion boards is usually limited to two or three.
The LPX form factor is gradually being replaced by NLX.