ok, I have released the source of the x15 ccminer.

It can be found here: https://github.com/djm34/ccminer
compilation on windows takes forever (sorry for that).
It should compile on linux (I fixed the Makefile.am), if anything is missing let me know...

To run x15 "ccminer -a x15"
as previously said, it is far from perfect (gpu usage rather low around 80%, so there are room for optimisation... and exceptionally the 780ti runs at 74°C).
I get at the moment (started on the previous compilation):

1467MHash/s for the 750ti
2900MHash/s for the 780ti (on supernova...)