7950 with 3Gb ram here (no OC, 850 core,1200 mem speed, undervolted to 0.962), after the new N factor I've changed the following:

Thread concurrency from 16384 to 32768

Intensity from 17 to 15

No Hw errors

Hash dropped from 205 to 95

--intensity 15 --lookup-gap 2 --worksize 256 --expiry 10 --scan-time 1 --gpu-threads 1 --vectors 1 --thread-concurrency 32768 --shaders 1792 --no-submit-stale