The reason I am asking is that I believe the 780 could do nearly double of what a 660Ti does.
looking at the Google Docs spreadsheet I see this:
GeForce GTX 780 Windows 7 Pro x64 11/2/2013 280+ -H 1 -l K48x6 -C 2
hmm, if he also specified -i 0, I think more than 300 kHash can be achieved. Also the device does have Compute 3.5 - maybe the Titan kernel would also be worth a try.
Christian