When is vega's release date?  Will rx470/480 become obsolete for gpu mining when vega comes out? Should i wait ?

is 80% fan speed safe for 24/7 mining ?

I have 6 rx480, with modded overclocked + memshift bios. With solo eth mining , they draw 77W power ,core voltage at 950mV.
However, when they dual mine , their power consumption rise to 110W+, core voltage drops below 935mV, at 60C temp .Will this damage my gpus in the long run?

I need a find-tuned modded bios for MSI ARMOR RX480 8GB OC-----0.5ETH reward
they all have samsung memory
i'm currently getting 27.4Mh/s without timing bios,overclocked to 2200Mhz,other settings at stock,using 119W power
any experts can help me??

original rom:https://drive.google.com/open?id=0B5YuEy7Ya0bcZzU3UDU1Yk9WRWs


(someone pm me with 2 rom ,will try them tmr , no more roms needed for now ,thank you all)