I think there's a card or two which have problems with it. I have only used one card in my z2 daughterboard, namely an Ariadne 2, and I've never had any problems using that. In the same box were a BlizzardPPC and a BVision. Bear in mind though that Z2 is sloooooooooOOOOOOOOOOooooooooooooooow; I'm not to sure that a Z2 based gfx card would be a very nice to work with.
