Apple 7100/80AV, 7100/66AV specs

Basics	Power Macintosh System Overview - 6
	5 The Power Macintosh AV systems use the same logic
	board as the non-AV versions. The only difference is that
	the AV versions have the Power Macintosh AV Card
	installed in the PDS slot.
	The Power Macintosh 7100/66 and 7100/80 systems
	must have a video card installed in the PDS slot. These
	systems use the Power Macintosh 2 MB Video Card. A
	missing card can result in a system that won't boot or a
	system that crashes.

Apple 7100/80AV, 7100/66AV manual