Will the change in Dave Andersen's code on github increase the hash for a 660ti card already running at 290kh???
you're already running it. It's in the 2013-12-18 release.
The github version adds maybe 10 or 15 kHash/s more (by supporting the -C 1 flag). It will be in the next cudaminer release, toggether with scrypt-jane (Yacoin) mining support.
I just mined my first Yacoin block SOLO. One 660Ti plus 2 GT 640 cards add up to 4.5 kHash/s, which is significant hashing power for Yacoin (the whole Yacoin network is around 1000-1500 kHash/s only, with blocks being generated once per minute.)
Ahh Ok.... i'll wait on the new cudaminer then, what do you think the ETA is, not wanting to rush you.
Congrats on you Yacoin... are they worth anything yet??