It's sprayed all over TFA: CAD
Mind that this was early Windows XP era. The Windows "workstation" would probably have something like a RIVA TNT with 16MB of graphics memory. Meanwhile the Intellistation had way more powerful options (e.g. 128MB on a single card, or exotic 4 cards x 16MB configurations).
But even if you could beef your PC hardware to similar specs, the CAD software was probably just not there (yet). Not to mention that pre-SP2 Windows XP were pretty terrible on their own.
nVidia had Quadro https://en.wikipedia.org/wiki/Quadro Generally the same GPUs, but with different memory configurations and firmwares.
The ATi equivalent was FireGL.
A TNT was from the late 90s. In 2006 512MB consumer GPUs were common.