5 x eVGA 750Ti SC non overclocked = 61MH
but I'm unsure how to explicitly compile it for sm_35 and 128 regcount this time (due to the new Makefile.am). Everytime I get invalid calculations for the shares. But I think compiling with standard settings is a bit slower on groestlcoin atm. Any advice?
on compute 3.0 and above we're using a block size of 768 which cannot work with more than 80 regs per thread.
it's the reason the 750Ti jumped from 9 MHash to 11 MHash... just like that

ah, thanks for clarification. just two more questions:
1. under linux, after compiling all compute settings are within one executable? how can I make sure, that sm_35 is used?
2. is there a possibility to change regcount for a specific algo (in my case groestl) while having it untouched for all the others?
yes. (I don't know which files contains the compilation setting in linux... however grep is your best friend)