it is approximately the same as a gtx 285 in terms of specs (other than the 4GB as you mentioned) but just so you know, it is certainly not intended to render graphics at a continuous rate (aka games), its a workstation card designed for highly detailed 3d modeling in programs like 3dsmax, cad, and such, frame by frame--like what you would use to create realistic images such as what are seen in the special effects of movies.
I need to look around again. I remember a moding article that instructs how to install Quadro drivers on a 8800 and a 9800. It said certain Geforce drivers are also compatible for Quadro cards. You just have to look at a certain file in the driver pack that states card compatibility... One of those things I should have bookmarked.
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