your card will probably work up to a point but The Geforce range are really gaming cards not workstation cards. The more recent gaming cards seem to work much better with 3D apps but even some workstaion cards have a few issues.
You probably have to lower the resolution, i've got an ati radeon x1950xtx 512 mb card and it only renders hardware to 512*400 (or something like this), if you can wait until maya 2008 comes out because in this version mental ray can render them
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