Comment by formerly_proven

From my reading SGI was already dead and falling apart by that time. If you look at 3D, SGI had two graphics architectures in the 90s: RealityEngine from 1992 and InfiniteReality from 1996. They never managed to release a follow-up to IR. Similarly everything that came after about 1996-97 was a refresh of a prior product with only marginal changes. And then they went bankrupt in the early 2000s. So SGI had really only a very brief productive period that was over by the second half of the 1990s.

SGI also never had a presence in business critical applications which gave some of the other vendors more momentum (HP-UX/PA-RISC, VMS/Alpha, Solaris/SPARC).