Anyone getting good hashrates running a 7970 + cgminer + Litecoin?

Ive been having nothing but trouble trying to get consistant hashing over 550kh/s. I can get 650-700 for 20 minutes and then i get drivers crashing. Windows 7 64bit. Temps are below 80C on the GPU and below 90C on the VRM. Ive run furmark for an hour straight to rule out it being a bad card. Ive tried many different driver setups, 2 fresh installs.

This might have something to do with it...
http://support.amd.com/us/kbarticles/Pages/737-27116RadeonSeries-ATIKMDAGhasstoppedrespondingerrormessages.aspx

Please list the catalyst version you are running, amd app sdk version, and your command line for cgminer + hashrate.

Im willing to pay in litecoin for a consistant 700kh/s.