I recently got a new system with a GTX 770- and Win8, both of which SL considers "unsupported", however, it does run fine on ultra settng, and (after inserting the lines In the gpu-table.txt file--- as described in the chart provided above (previous page) for the 700 series cards), I now can run Ultra and all of the advanced lighting options, including DOF- and all seens fine.
One other thing I learned here somewhere about the NVidia numbering---- the second number of the series is the oen that indiciates performance where as the first number is the sequence of release-- there fore theoretcially, a 690 may out-perform a 710-- all else being equal--its just tthat the 700 series is more recently released and may have other enhancements that make it overall better.. I actually think my dual GTX 285's bring me a fuller graphics "warmth" than the GTX770, of course i have a lot more RAM with the GTX 285 also, so that may the reason there. but both run fine now on ultra--with full Advanced lighting options enabled.
Hope this helps you.