for some reason my r9 280's arent performing at max capacity. below is my setting with ybcminer, any ideas?
pingasminer -o stratum+tcp://speedminers.com:1122 -u XXX -p XXX --scrypt --Nfmin 4 --Nfmax 30 --StartT 1388157521 --thread-concurrency 8921 --lookup-gap 2 -I 18 -g 2 -w 256
If you are using -g 2 you should only set the intensity to max 13, over that will give hardware errors I think.