**Bounty claimed by Eddyfitz and Aggrophobia** 300-400s are now working on the YAC scrypt which is fantastic. of course though if higher speed is found, more bounty is available.
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Right now my 7970s get 150Kh/s using;
--worksize 256 --lookup-gap 2 -I 11 --thread-concurrency 8192
I offer 200 YAC per 100Kh/s increase on a 7970 for whoever first figures this out.
OS is Win8x64, SDK 2.8
Overclock settings don't count, unless you have a magic number. As I've tried a few ratios, etc. and feel I've found 1090/1500 to work best on my 7970s for scrypt coins. 1050/1500 is also good.
The trouble some of us seem to be having is anything over intensity 11 causes display driver crash. And anything over 8192 and it won't mine.
Maybe it's something very simple, or a unique combo of numbers, maybe it's not.
This the program;
https://bitcointalksearch.org/topic/ann-yet-another-gpu-miner-release-yac-232241**please note this is for the yacoin scrypt, that's why OC settings don't count, these cards get 750-760Kh/s using 1090/1500 on regular scrypt coins no problem.