Hi Guys
Im mining with R9 290ref , 280X Gaming and 270X Dual-X
i just need to ask can anyone help me to get more mh/s on these gpus?
i read this thread i think im getting highest hashrate but any help can be fine

R9 290 @ 1030/1250MHZ = 5.25MH/s
R9 280X @ 1100/1550MH = 4.2MH/s
R9 270X @ 1140/1450MHZ = 2.65MH/s

all of gpus are running at amd 14.6 beta driver

thnaks.