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i get about 300khs on a reference 7850, 3% undervolt, stock clocks--thread-concurrency 4096 -g 2 -worksize 256
For hd7850 "thread-concurrency" value is 8192. It's mandatory and overrides "shaders" option as well. In case you haven't read SCRYPT-README (https://github.com/ckolivas/cgminer/blob/master/SCRYPT-README) carefully - "vectors" option doesn't use with "scrypt" option enabled. Frankly speaking, all you need in your conf file, besides pools, are:"intensity" : "13","thread-concurrency" : "8192","scrypt" : true
He's right. I messed with a batch of 7850's and 7870's and the highest I could get was ~270kh/s on the 7850's. Even overclocking didn't give you THAT much more speed, and increased the risk of rejects and stales as well. The best results I had were literally with intensity 12 or 13. Going higher than that started to drop them--I don't buy the github results as accurate at all. Maybe cgminer was saying "350 kh/s", but they probably had 30% rejects or constant errors. Remember to check your pool and see that its verifying what cgminer says--not always the case.
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