The FireGL T2 is a workstation-oriented graphics card. As the T41p is aimed at a high-end business machine, it is more attractive to that market as opposed to a "gaming" card.
Generally speaking, the T2 is optimised for OpenGL and windowed rendering, whereas the 9600 is suited more to fullscreen Direct3d. However, those optimisations are generally more specific to the driver, than the core of the card. If I remember right, the workstation cards have certain certifications so as to ensure that images are reproduced properly (for purposes of hardware accelerated rendering). Lastly, you'll find that you can normally get drivers for these cards from specific CAD firms (i.e. 3DSMax, Catia, AutoCad et al).
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