Hmm 173khash/so is all I can get out of my 780
My 780 is getting 345khash/s with this launch config
cudaminer.exe --algo=scrypt:2048 -D -i 0 -l T12x20 -o 127.0.0.1:15522 -O user:pass
What version of cudaminer are you running?
cudaminer.exe --algo=scrypt:2048 -d 1 -i 0 -l T12x20 -o 127.0.0.1:8108 -O 1:x
give sme 15 kh/s