ok, i have had a little success patorbeli

now i got it to working with -a scrypt-jane -i 0 -H 0 -m 0 -C 0 -l F2x3 -o , im only getting 0.37/0.40 on my gtx 560 ti and the computer becomes impossible to use, but its better than nothing.
Still attempting other setting, but most crash the driver :s
I am not sure if the experimental kernel will work on Fermi but try -i 1 and -l X2x3 with additional -L parameter to modify your lookup gap? -H 2 and -C 1 works best for my 560 Ti (non 448 core edition) with scrypt for maximum performance. If 175 khashes could be called maximum. Hope I helped you out a little bit! Benchmarking on any build and in any mode still makes my computer horribly unruly and lagging. Older builds didn't display that. The benchmark as well takes ages to complete.
Christian, are you communicating with your Nvidia Friend about CUDA 6? Will it give any performance enhancements for our old Fermi cards?