Hi Christian,
Thanks for your fast update again. It works great with Kepler & Maxwell cards, but unfortunately not with Fermi cards. (I mean jackpot algo).
I got
780 - 6Mhs
680 - 3.7Mhs
750ti - 2.9Mhs
Regards,
PS: FYI, for example my 580GTX get unrealistic hash if I try to solomine
[2014-05-01 13:27:48] thread 0: 79691777 hashes, 79731 khash/s
and with pool it said:
GPU #0: result for nonce $03EDFEBB does not validate on CPU (3 rounds)!
What clocks for your 750ti? I'm only getting 2.55-2.65 with my EVGA SC.

Maybe you are on risers? My rigs with 1x16 riser only get 2.6 per card too. Without risers some card gets 3Mhs. I can't overclock because I use Linux.