The High IMPACT and Solid IMPACT boards provide the same performance for non-textured tasks, while the Maximum IMPACT provides double the performance. Physically, they appear to be similar to the older graphics options the low-end Solid IMPACT board takes up a single GIO-64 slot, the mid-range High IMPACT takes up two GIO-64 slots, and the high end Maximum IMPACT occupies three. These newer boards have a different architecture than the earlier designs. The MGRAS IMPACT (or just IMPACT) family include the Solid IMPACT, High IMPACT, High IMPACT AA, and the Maximum IMPACT. The Indigo2 XZ was launched in August 1993 at $25,500 (equivalent to $51,700 in 2022) and the Indigo2 XL was launched in third quarter 1993 at $18,000 (equivalent to $36,500 in 2022). These options are based on the same Express Graphics architecture from the original SGI Indigo, but feature improved performance. Pre-IMPACT options consist of the following options: Indigo2 XL24, Indigo2 XZ, Elan, and Extreme. The graphics options available for the Indigo2 can be divided in two groups: the pre-IMPACT and the MGRAS IMPACT boards. The second one offers better overall performance due to using the superior GIO64 bus, which also has the effect of reducing the CPU utilization due to DMA transfers. The two most known and widely used Indigo2 network cards are the 3Com 3C597-TX 100Mbit EISA, and the Phobos G160 GIO64. Advanced U160 and U320 SCSI disk drives can also be used but then one needs appropriate adapters (80/68-pin to 50-pin SCSI).ġ0Mbit on-board LAN interface, 100Mbit LAN options were made by third parties, either via EISA or GIO64 expansion cards. All of the Indigo2 drive sleds have a 50-pin female SCSI-1 connector and standard 4-pin power connector. The typical hard disks are narrow (SCSI-1) 5200rpm and 7200rpm drives. The internal SCSI bus speed of the Indigo2 is about 10 MB/s. All three drive bays are easily accessed when removing the Indigo2 front bezel. Later 128 MB modules allow the full 1 GB with eight out of twelve sockets occupied.Īll Indigo2 models can accommodate two 3.5" SCSI disk drives and one 5.25" SCSI CD-ROM drive inside bays on the front of the machine, using specially designed Indigo2 drive sleds with proprietary connectors. With newer, higher-density and smaller scale modules, 768 MB is easily within heat output specifications. The design of the memory control logic in R10000 machines support up to 1 GB RAM, but the thermal output of older generation of DRAM chips necessitate the 512 MB limit. Indigo2 can be expanded to a thermal specification maximum of either 384 MB or 512 MB RAM. Each microprocessor family differs in clock frequency, and in primary and secondary cache capacity.Īll Indigo2 motherboards have 12 SIMM slots, for standard 36-bit parity 72-pin fast page mode SIMM memory modules seated in groups of four. The later IMPACT Indigo2 workstation model has more computational and visualization power, especially due to the introduction of the R10000 series RISC CPU and IMPACT graphics.Īll Indigo2 models use one of four distinct MIPS CPU 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. Power Indigo2 is a version of the teal Indigo2, with the R8000 chipset and strong floating-point arithmetic performance. The CPU types, the amount of RAM, and graphics capabilities, depend on the model or sub-model variation. Both have identical looking cases except color, and sub-model case badging. Indigo2 desktop workstations have two models: the teal Indigo2 and the purple IMPACT. The Indigo preceded the Indigo2, which is succeeded by the Octane. Both systems are based on the MIPS processors, with EISA bus and SGI proprietary GIO64 expansion bus via a riser card. The Challenge M is a server which differs from the Indigo2 only by a slightly differently colored and badged case, and the absence of graphics and sound hardware. The Indigo2, codenamed "Fullhouse", is a desktop workstation. The SGI Indigo2 (stylized as "Indigo 2") and the SGI Challenge M are Unix workstations which were designed and sold by SGI from 1992 to 1997. SGI Indigo2 IMPACT and a promotional SGI espresso machine in an Indigo case Indigo2 IMPACT R10000 Badge for a Power Indigo2 with Extreme Graphics JSTOR ( March 2021) ( Learn how and when to remove this template message).Unsourced material may be challenged and removed.įind sources: "SGI Indigo² and Challenge M" – news Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification.
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