Incredible, though, how the relatively cheaper Windows NT machines and 3dfx cards and graphics software just killed them. I was a little sad when I wandered around the campus of an employer in Mountain View and noticed the fading sign that had what was left of the SGI logo.
I co-oped for SGI onsite in the sales/marketing/support for a major ISP of the day back in the late 90s and the buzz around the office was that the company (at this point experimenting with overpriced Windows NT boxes and generic Linux servers) was experiencing massive brain drain to some brand new startup that was going to make something called a "GeForce" card for cheap PCs that was going to avoid the pitfalls of the then popular Voodoo cards. Apparently the engineers were unhappy with the direction the company was taking under the new leadership and thought that there was still an interest in graphics acceleration.
https://en.wikipedia.org/wiki/Silicon_Graphics_International
I had a couple of Indigos that I supported while an undergraduate (I had a student job with the University's Unix group in their computing center), and the SGIs felt to me exactly like the Amiga- Really cool, but kind of lopsided. I tended to do most of my work on the SPARCstations and ignore the SGIs unless I specifically wanted to play with the graphics stuff.
I actually still have an Indigo XS24 that I collected at one point over the years. Tried to get it to boot a bit ago but it's dead, unfortunately.
3Dfx grew up in the arcade market. They were always consumer-focused.