My groestl on my 750Ti's are 3.5MH/s per card
And i always take into account power usage. £0.67 a day at the moment
The current ccminer development version does around 25 MHash/s for groestlcoin on 3 750 Ti cards. EVGA FTW edition, no overclock beyond factory clocks due to running Linux. With a bit of OC, that would be 9 MHash/s per card.