networkman :
Flex ATX is a new motherboard specification for extremely small cases. The usual motherboard size is 9 inches by 7.5 inches. It is used in small footprint highly integrated PC designs.
The main Flex Motherboards I am aware of are the ASUS CUSI-FX, CUW-FX and the Intel D810EMO.
Most of them are based on the i810 chipset, but the CUSI-FX is based on the sis 630 and offers more expandability than the others.
I need an AGP slot because there are no GeForce in PCI format and the PCI Voodoo 5 is 9.6 inches long. I had not seen a videocard this long since my old voodoo Rush!!!