YES, if you can find two Voodoo 2's or 3's one in either flavour and then dig up some really old drivers from the interwibble, also a vga connector lead would be required, I used the one from my 4MB Orchid 3DFX accelarator card but you might find those a little hard to find these days.
More to the point, why would you want to run a pci & an agp card together?