LPX (form factor)

The motherboard of a Dell System 325P, sporting the LPX form factor; the socket for the riser card is at the top left
Typical LPX riser card, with connectors for PCI and ISA cards

LPX (short for low profile extension) was a loosely defined motherboard format (form factor) widely used from the late 1980s to the late 1990s. The format was originally developed by Western Digital who based their design off the IBM PS/2 Model 30. A defining feature of motherboards with the LPX form factor is the integration of controllers and ports, which used to be separate add-ons on the earlier AT and Baby AT motherboards, as well as riser cards and slimline power supplies. The use of a riser card to horizontally position expansion cards allowed computer cases designed around LPX motherboards to be much smaller than earlier AT-based cases.

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