I have 4 7950s and I pull ~640 kh out of each card with these settings.
cgminer.exe --scrypt -o stratum+tcp://eu.wemineltc.com:3333 -u user -p pass --shaders 1792 --gpu-engine 1100 --gpu-memclock 1625 --gpu-fan 100 --thread-concurrency 21712 -I 20 -g 1 -w 256
That said my pay per round is about half of what the estimated actually is, its like only ~1400 kh are actually making it through to the server. Any idea why I am only earning around half of what any calculator is suggesting?
I have a large array of 7950's as well and my settings are basically the same...I've found benefits of being a little higher with gpu engine clocks when temps allow 1125...my concurrency is exactly this as well as worksize and intensity. 500 would be about right with such conservative gpu settings as was posted earlier.
More importantlyPlease somebody address the payout issue...I'm still below half of my expected payout after 10 blocks...this is well beyond my ramp up time in the past and its stabilized low. I wonder is your code splitting with the added servers now and not calculating payout correctly?