TechARP has a guide about transforming your GeForce card into a Quadro card:
The NVIDIA Quadro family of professional graphics cards are very, very expensive. But everyone knows that Quadro and GeForce graphics cards are virtually identical in hardware.
Obviously, you cannot just use Quadro drivers with your GeForce graphics cards. However, there is an easy way to soft-mod (modify in software) an NVIDIA GeForce desktop graphics card into an NVIDIA Quadro professional graphics card. We will show you just how to do it in this guide.
Not only that, we have also added a new page with performance results from the soft-modding of an NVIDIA GeForce 7950 GT to the Quadro FX 3500. Read on and find out.
"It all revolves around the driver support for professional 3D applications like 3ds Max or Maya. Quadro drivers allow the Quadro to be used to accelerate the rendering operations of such professional 3D applications while GeForce drivers do not. This is the basis for the premium prices NVIDIA (and ATI) charge for their professional-grade graphics cards."