miner -- yacminer-3.5.0-yac2-x86
yacminer --scrypt-chacha --worksize 256 -o stratum+tcp://yac.coinmine.pl:9088 -u xxx -p xxx --thread-concurrency 79104 -R 3072 --buffer-size 1576 --lookup-gap 8 ----- HW - HW ---
You need to allocate more memory. remove thread-concurrency and replace it with "--buffer-size 1536". After you verified you can mine with those settings, increase buffer-size to as high as you can without getting the program crashing or a warning from it. Then, increase -R until you start getting HW errors, then back it down just a bit