tahiti (280x&7970) works perfectly with 10-12sol per card.
390 require a lot of virtual memory - 38Gb on 6 card.
why there is no overclocking effect?
Don't you have invalid solutions? Does the pool stats correspond to your hashrate? And last, why only 10 sols? My tahiti is at least 18 sols, but with invalid solutions. Not a single accepted share. My cards are not overclocked, but undervolted with bios mod. It seems that most of the people have the same isuue.
all shares accepted, hashrate on pool is correct + - , (1100/1500 on 1050mV all with StilitBios win8.1&win10 15.12drivers).
I do not understand how tahiti can give such a hash. My 290/390 give 14-17sol/s on this miner.
390 too all shares accept hashrate 14-17, but what with overclock(1150/1400) what without (1050/1600) hashrate does not change.
p.s. if you see message opencl memory errors and reboot miner - increase the amount of virtual memory.
p.p.s. if you see stop your device (-4) run the second copy of miner in another window, but only for the card with which the first miner refuses to work. For example "DEVICES" : [1]