Yes, with MicroCoin, it that special?
I seem to have a "lucky card", it automagically clocks itself higher than the factory overclock suggests.
I think that's about normal. My Gigabyte 780 gets a little over 500 on MicroCoin.
On another note, I just got back from the airport and sat down at the computer my 780 is mining on and noticed that things were behaving a little funky. Turns out the SSD was full and my output log contained 77GB worth of cuda errors. (I've been running cudaminer in a forked bash shell and redirecting stdout to a log). Thank goodness for trim.
I also have a Gigabyte 780. I get around 515kh/s with: -H 2 -a scrypt-jane:MRC -l T24x20
If I overclock the base clock +194, memory clock -500, and power +5%, I get 580kh/s.
cudaminer is awesome