I've been hearing a little bit about NVidia's L Ray lighting & rendering system that supposedly works with DS 4.8 I've been away for a while and haven't had time to do any DS work in months. 

1. Which NVidia cards are compatible with L Ray?

a. Do I need one of the very latest like the 960-980 cards, that Titan-X beast, or one of the Pro level Quadro cards costing both arms, legs & an internal organ?

b. I currently have a relatively old GTX 770 card. Would that work by any chance? (crossing fingers)

2. Do I need to download additional software from NVidia afterwards? This segways into next question...

3. Does L Ray come installed with DS4.8 or is DS simply compatible with it and I have to pay separately for it from NVidia site somewhere?  

4. Are there tutorial videos to help learn the use of it? And in Plain English not requiring an advanced degree.