I spent weeks faffing around and couldn't get past 550kash with the same card.
Clock speeds set in Afterburner 1045/1500.
I use cgminer, make sure you run this first:
setx GPU_MAX_ALLOC_PERCENT 100
I use the following command and get 650khash+
cgminer.exe --scrypt -o http://pool:port -u xxx -p xxx --worksize 256 -g2 -I 13 --lookup-gap 2 --shaders 2048 --thread-concurrency 8192
I user Catalyst 13.5, haven't touched bios, voltages etc.
![](https://ip.bitcointalk.org/?u=http%3A%2F%2Fi41.tinypic.com%2Fano3ex.png&t=663&c=HJ2dBvEANy4bqQ)