Back in the day I used to make long animations that I played from RAM through Scala and then genlocked onto video tape. Some of the animations were Vista Fly-throughs but most were raytraces. The biggest single animation I made was about 119mb and I slapped that in RAM because I had a full Cyberstorm card.
If I go back to that as a hobby I will have enough RAM to make quite a big animation because I have finally sorted out my PPC SIMM problem. So now I have the 128 on the PPC card, another 128 on a DKB3128 board, plus the 16 on the mobo. That's quite a bit.
By the way, raytracing with Cinema4D and high detail / polygon counts SUCKS UP the RAM. You think 128mb is a lot, it isn't. I got out of memory errors many a time with only 128mb.
On the PC side, Cinema 4D has soaked up 580mb of RAM all on its own, so the Amiga is still a very memory-friendly machine.