I got
740KH/s on my 7970. This is the setting that I want to share for you all:
Driver:
13.1cgminer: any version (lastest 3.1.0 recommended)
Core/mem:
1050/1750bat file:
start /realtime cgminer --scrypt --intensity 13 --lookup-gap 2 -g 2 -w 256 --thread-concurrency 8192 -o stratum+tcp://us.litecoinpool.org:3333 -u *** -p ***
IMPORTANT: Format your C: drive, then install a clean Windows 7 64 bit.