"Pre-IMPACT" options consisted of the following options: SGI XL24, SGI XZ, SGI Elan and SGI Extreme).
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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.
Challenge Cup | Challenge Tour | Challenge Anneka | University Challenge | Millennium Challenge Corporation | Diamond Challenge Sculls | USA Pro Cycling Challenge | Challenge | The Great Indian Laughter Challenge | Infinite Challenge | WRU Challenge Cup | World Club Challenge | SGI Origin 2000 | Sa Re Ga Ma Pa Challenge 2005 | Real World/Road Rules Challenge: Fresh Meat | Grand Challenge Cup | Fletcher Challenge | FIRST Tech Challenge | Extra Challenge | Ultimate Poker Challenge | The Man and the Challenge | SGI Onyx2 | Rachel's Challenge | Power Challenge | Intercontinental Rally Challenge | Global Challenge | DARPA Grand Challenge | Challenge (TV channel) | Challenge for Change | Challenge Cup (UK Ice Hockey) |