Quote - Nvidia cards support OpenCL GPU processing as well, they just aren't as efficient at processing OpenCL instructions as ATI cards. Cycles, LuxRender SLG (GPU only) and CPU+GPU all use OpenCL, and run on Nvidia cards.

Thank you for clarifying.

I passed on a 3GB 780 in favor of my 4G 760 when I was built my render rig last October, because I didn't want to spend more on the 780.  Eight months later, I can afford to get an even better version of the 780 than what was available at the time.

Even though Cycles doesn't currently offer SSS, I can still enjoy the extra rendering power while learning how to use Blender.  And once Paolo greenlights GPU rendering with Reality, I can take advantage of nVidia's support for OpenCL.

Amazon dropped the price on the 6GB 780 another $10 to $570 for Prime members - $30 off from its $600 MSRP.  I'm not passing that up, so I've re-ordered one.  It'll be here Monday.