@MasterChief: In the nVidia control panel, set options to let application decide where that option exists.

Bring up the Superfly render settings and give us a screenshot.

That screengrab of GPU-Z appears to show that your card has 2GB of VRAM; that's minimal for GPU rendering, more so if you are driving your monitor(s) from that video card. Where your reference to 8GB in your opening post come from? Is that the computer's RAM?

Poser 12, in feet.  

OSes:  Win7Prox64, Win7Ultx64

Silo Pro 2.5.6 64bit, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5