SGI Indigo2

The SGI Indigo² and the SGI Challenge M were Unix computers marketed by SGI from 1992 to 1997.

The Indigo², code named Fullhouse, was a desktop workstation. The Challenge M was a server which differed from the Indigo² only by a slightly differently colored and badged case, and the absence of graphics and sound hardware. Both systems were based on the MIPS processors. Both systems supported EISA bus and SGI proprietary GIO64 expansion bus via a riser card.

SGI Indigo² workstation is a direct successor to the SGI Indigo model. Until the introduction of SGI Octane, SGI Indigo² was SGI's most powerful desktop system for 3D, visualization and high performance computing environments.

SGI Indigo² desktop workstations had two models: the teal case Indigo² - earlier model (original concept), and the later - often called IMPACT model - with purple colored case. Both looked the same from outside except color, and sub-model case badging. The available CPU types, the amount of RAM and GFX capabilities depends on the model or sub-model variation. There was a special version of the "Teal" Indigo², called Power Indigo²; this system had increased FPU (floating point unit) capabilities and used specially designed R8000 CPUs. It's natural that later IMPACT Indigo² workstation model gives more computational and visualization power, especially due to the introduction of R10000 series RISC CPU, and IMPACT graphics.

All Indigo² models use one of four distinct MIPS microprocessor variants: the 100 to 250 MHz MIPS R4000 and R4400, and the Quantum Effect Devices R4600 (IP22 mainboard); the 75 MHz MIPS R8000 (IP26 mainboard); and the 175 to 195 MHz R10000 (IP28 mainboard), which are featured in the last produced Indigo² model, the "IMPACT10000". Each microprocessor family differs in clock frequency, primary and secondary cache capacity.

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