sgi used to be the the (!!!) company for highend workstations in the past.
Their unix IRIX is an excellent OS, but it lacks support from the major software companies.
I work in the automotive design and traditionally we worked on sgi's (Indigo2, Octane + Octane2).
The software is Alias Studio|Tools and Icem Surf and visualisation is made on Opticore or Icem realtime renderer.
I am still a big fan of IRIX (it is simple the best Unix on the planet...), but the hardware is outperformed by modern P3 and P4 workstations with good graphics cards.
Even the newest sgi workstation fuel with the latest graphic V12 and the R16k is outperformed in any way by modern PeeCee-workstations. It is more than sad...
The only reason why large companies stay with sgi is their structure of maintaining the systems. Admins hate the idea of administrating 50 pc-based workstations!
Fact is, I am still owning an Octane Dual R12k 300 Mhz and MXE graphics, 2gb ram ++++...
I have at home as a statue and a symbol for my company founding. I do my work at home on an Dual P3 Intergraph zx10 with wildcat 5110 and it is uncomparable faster than the sgi.
At work I am using a Dual Xeon P4 with Quadro4 graphics and this is a really fast machine. Currently there is no software which is performing better on the desktop under Irix. Graphic speed is a laugh. VPro sgi means nothing more than quadro2!
When you in the need of computing fem analysis and or crash simulations on multiprocessor systems than you go for sgi server and their great OS Irix. The server with 32-512 possible cpu's will do the job thanks to their scaling.
As a workstation forget sgi ....
I am still hoping that sgi will find their return and blow away this pc-stuff!