THE BEST GRAPHICS CARD FOR SOLIDWORKS
I think NVIDIA QUADRO 2000 & UP You Can Find More Specifications In http://www.nvidia.com/object/workstation-solutions.html#
There are really only four cards to seriously consider when using SolidWorks. The highest end cards aren't fully utilized by solidworks, so there is no reason to waste money on overly expensive graphics cards.
The four cards are ATI Firepro V5900, ATI Firepro V4900. Nvidia Quadro 2000, Nvidia Quadro 4000
V5900> Quadro 4000
V4900> Quadro 2000
and unless you're working with very large assemblies 10,000+ , the best choice of graphics card is the V4900
<a href="http://solidwize.com/webinars" onclick="window.open(this.href); return false;">Check out our Free SolidWorks Webinars
I recommend checking out the article here: http://computeraideddesignguide.com/best-solidworks-graphics-card/
They discuss a SolidWorks tool which you can use to determine a good card. Also, they review 2 of the best cards. Try one.