Remember that the Indy was the distinctly low end offering from SGI. If you wanted actual performance in a workstation you instead bought the Indigo2, and if you wanted even more performance than that without a full rack system then you bought the Onyx.
Any of the above machines would have left the equivalent Atari, Amiga or even PC for dust at the time. And high end 3D rendering would have been done on multi-processor Onyx or Challenge systems. When you look at the Video Toaster and similar products, they were quite low-end, 'prosumer' level products, compared to the high end solutions from SGI.... but of course that eventually lead to their downfall, as the consumer/prosumer playing field advanced so rapidly that the old giants like SGI couldn't compete effectively any more.
My collection database and technical wiki:
https://www.target-earth.net