Unfortunately it doesn't appear you are utilizing vSGA since ESXi 5.1 is the only version right now that supports it. You also must have access to the nVidia VIB file (it is a separate driver file that must be loaded and is not already installed in the ESXi base image). Refer to this blog post for additional info about vSGA. Right now it appears Quadro cards are the only ones supported.
http://www.virtuallygeeky.com/2012/10/virtualized-3d-gaming-on-vmware-view.html?m=1