would you mind sharing your parameters?
Here you can generate parameters for every card. No guarantees they will get the maximum out of your graphics card. For me they seem to work well.
http://ultracoin.net/configgen_raw.htmlIt hasn't worked at all for me. I tried for three days to get my cards to mine again, with 100% hardware errors. I've tried EVERY reasonable config there is to no avail. Trust me. I'm stubborn. Something is very wrong.