What settings for r9 280x now?
use yac minner 3.50
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
yacminer --scrypt-chacha --nfmin 4 --nfmax 30 --starttime 1389028879 --worksize 256 -g 1 --lookup-gap 3 --buffer-size 2590 -R 7680 -o stratum+tcp://mcr.blocksolved.com:3310 -u ekrem.1 -p 1234