I'm doing 2150MH per 750TI at default clocks speeds on my Gigabyte 750tis right now. Chris and Chris have said they have a version doing 2.8MH that will be released soon.  They also have a new version of Groestl that is far better also, but no eta on that one.  I can't wait to see what they can do with higher end Maxwell cards that will be released later in the year. 

Remember this cheap $150ish 750ti card competes with 270x on price but eats 290x on performance which is utterly fantastic (if you own a few of them)!