If you're working on TV commercials maybe an IBM linux machine is the best bet for you.
The main differences are that you can work with 8,10 and 12 bit on an SGI machine while you can only work at 8 bits on linux. 8 bit is enough for TV, though you would have an advantage of the 10 bit or 12 bit, for keying and colour correction.
Another difference is that you have a 4 channel audio I/O, while on SGI you can have up to 8 (though internally both have the ability to handle up to 32). SGI has keycode support, and if you choose the correct configuration you could work up to 2K while on linux you can work up to HD on realtime. Another plus for the SGI is that it can import and export, AVI's, MOV's (quicktime 3 codecs) and SGI movies, while the linux box can't (unless you use mplayer to convert movs into a file sequence). Another difference in this release is that the SGI box will run at 64 bits, making it possible to work faster with high res images.
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