LPX is a motherboard form factor
originally developed by Western Digital when it was making motherboards that was
used in the late 1980s and throughout the 1990s. The LPX motherboard is 9"
wide x 13" deep, uses a riser card, and has a different placement of the
video, parallel, serial, and PS/2 ports on the back when compared to other
motherboards. Below is a picture of a Packard Bell LPX motherboard, as can be
seen this motherboard has one large brown slot for the riser card. Using a
riser card allowed the expansion cards to be installed parallel to the
motherboard, which is why the LP in LPX stands for "Low Profile." The
low profile allowed computers using this motherboard to be much slimmer than
computers using a Baby-AT motherboard.(BD IT TALK)
The LPX motherboard was not the only
motherboard to have a riser card. The NLX motherboard also has a riser card,
however, the NLX motherboard actually plugged into the riser card instead of
having the riser card on the motherboard.