I have a newertech g3 card in my 7100/66 (runs at 248Mhz on that machine and has the 1MB cache), it has the pass-through cable going to a PDS video card (upside down on a bracket that sits on a Nubus slot). I have not looked to see if the passthrough is on a socket or a permanent part of the card. I think the pass-through is hard to find by itself. The 7100 has 3 Nubus slots and the PDS adapter needs the middle one. The 6100 is probably different since its only expansion is at an angle.