Hmm, you will be processing twice as many frames as normal.
to make you aware, you will have to run games at lower settings with 3D vision, as your system has to do twice the work...I presume you have a 3D monitor etc.
If I was to do 3D I wouldnt do it with anything less than a 470...thats my opinion. your Dual Core shouldnt bottleneck the GFX that much...but its worth an upgrade.