Motherboards with only AGP slot

I am trying to find a motherboard with only a AGP slot on it so I can hang a large graphics card in line with the motherboard can any one help
 
large like Voodoo 5 5500 large ?

if so, why does affect what slots the board has ?

surely it's down to case sizes ? :) i might be getting the wrong end of the stick though
 
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