SGI Silicon Graphics Indigo (R45K)
Indigo, introduced by Silicon Graphics in 1991, was a landmark 3D workstation. From Retrobeep's page on the Indigo:
The SGI Indigo typically has a MIPS R3000 processor at 33MHz or a MIPS R4000 processor at 100MHz (the latter machine being classified as an "R4k Indigo"). However, you can upgrade the R4k Indigo to a 150MHz R4400 processor.
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