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What kind of hashrate do you get if you don't set thread-concurrency manually?Have you tried command "setx GPU_MAX_ALLOC_PERCENT 100"? It should allow higher thread-concurrency values. Have you tried argument "-g 2" instead of "-g 1"? It sets the number of threads the miner is using. The -w switch stands for worksize, I'm not entirely sure what it means but people use a lot of "-w 256" instead of "-w 512".You could try following this guide: https://teksyndicate.com/forum/litecoin/how-tweak-your-settings-and-squeeze-khs-out-your-card-using-cgminer/137706. I tried some of its advice, didn't work very well but it might work for you, who knows?
I believe I have the same exact card, the Gigabyte R9 270x WindForce. I am able to get ~480kh/s with no problems on one machine. Here is the bat I use:setx GPU_MAX_ALLOC_PERCENT 800setx GPU_USE_SYNC_OBJECTS 1cgminer.exe --scrypt -o URL -u USER -p PASSWORD --no-submit-stale --verbose -I 19 -w 256 -g 1 --thread-concurrency 15232 --gpu-fan 85 --lookup-gap 2 --gpu-engine 1115 --gpu-memclock 1500 --gpu-powertune 20Note that I have three machines, one with dual R9 270x, and the other two with a single 270x. Each machine has the same environment (Win7Pro x64), same drivers (13.1), and same CGMiner (3.7.2) and they all need to have the parameters adjusted. The bat file will not work on all three machines, however it only takes a few trial and errors to get the speed once you have the bulk of the options down. Don't worry about the "-w" option, it just sets the desired work load. It will not affect your hash rate. The mining pool can totally ignore that flag if it so desires.
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