I have a few questions regarding LTC mining in general:
1) 7970 GHz edition: my card comes with factory clocks of 1050/1500; using various thread concurrency settings and intensity settings, I think the best I ever manage is a measly 450khash. I have also had issues with getting GUIminer-scrypt to work properly on this machine -- I think the best I got was maybe 300-350khash. If someone has some suggestions, I'm all ears!
Try
--thread-concurrency 3072 -g 9 -I 13 --gpu-powertune 20,
and possibly --worksize 256Edit: terrible advice - although it reports a higher hash rate, it just generates garbage (never gets a share).
Do try using the --powertune option though, and possibly --thread-concurrency 8192 -g 5 or thereabouts - which does seem to give me a slight edge over large concurrencies and -g 1.