The SGI Challenge, code named Eveready (deskside models) and Terminator (rackmount models), is a series of multiprocessor server computers developed and manufactured by Silicon Graphics in the early to mid 1990s that succeeded the earlier Power (not to be confused with the IBM POWER) series systems. The Challenge was later succeeded by the NUMAlink-based Origin 200 and Origin 2000 in 1996. The system architecture of the Challenge is based around the POWERpath-2 bus, a 256-bit bus clocked at 47.6 MHz that delivers 1.2 GB/s of sustained bandwidth.
There are three distinctive models of the Challenge. The first model, simply known as the "Challenge" used the 64-bit R4400. With the introduction of the R8000, the Challenge was upgraded to support more processors and memory as well as featuring support for this new processor. Such systems are known as the "POWER Challenge". During the final years of the Challenge architecture's useful life, the line was upgraded to support R10000 microprocessors. Older Challenge systems using the R10000 were known as the "Challenge 10000", while the newer POWER Challenge systems using the R10000 were known as the "POWER Challenge 10000"
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