same goes here, 2.5 max, what is your config? thanks
For x11, x13 and x15, worksize does important to get better hashrate
I was experienced that 280x gives best hashrate on worksize 64, but 7950 and 270x good on worksize 128
280x - 2.7MH/s
-I 19 -g 2 -w 64 --gpu-memclock 1250 --gpu-engine 1100 --gpu-fan 63
270x - 1.7MH/s / 7950 - 2.2MH/s
-I 19 -g 2 -w 128 --gpu-memclock 1250 --gpu-engine 1100 --gpu-fan 63 --gpu-powertune 20
-I 20 --thread-concurrency 21712 -g 1 -w 128 --gpu-engine 1200 --gpu-memclock 1800 --gpu-vddc 1200 --gpu-powertune 20 --gpu-fan 90 --temp-cutoff 85 --scan-time 1 --queue 4 --no-submit-stale