They made a PCI model as well as an AGP model. The PCI one worked better in the 66 mhz B&W video slot but also worked in a 33 mhz slot. There was a DVD decoder card that attached to the PCI version but it only seemed to work for me with the card in a 66mhz slot. The PCI Rage 128 came in two different speeds. The one with the heat sink being the faster.
I lucked into a couple dozen B&Ws with bad motherboards a few years ago. That let me upgrade the video in most of my PCI Macs. The processors went into beige G3s and a couple of ZIF carriers for the 76,86,9600s. Also scored a couple of the Rage 128 AV cards in the batch.
I've used the Rage 128 card in 7600,8600,9600, 6500, Beige G3s. I do use a couple of ATI Radion and a 9200 where I need a card with DVI output. Did have a Rage 128 in a 9600 driving a 27" HP monitor until I tried plugging My IIgs into it and blew the VGA circuit.