Low Profile Extended (LPX) is a form factor for motherboards that can be used in particularly flat cases.
With LPX, all interfaces are present on the motherboard. In LPX motherboards, the plug-in cards are installed horizontally. LPX boards have a size of 330 mm x 229 mm, in the largest version. LPX and the smaller Mini-LPX variant are quite inflexible in terms of expandability. The heat dissipation is not suitable for the use of powerful central processing units( CPU).