I am using 15.11.1 beta, win10 64 bit, either on ethminer or genoil miner
So if i read this correct, your core clock doesn't go higher than 900? Or what do you mean?
Driver should be fine.
It's probably an afterburner setting you're missing.
Put your ab settings like this:
Don't think it's Win10, never gave me issues. I had more issues with 7 though :p
I wouldn't do that.
Force constant voltage <-- it will, like it states, force a constant voltage, so in other words, the higher your core clock goes, the more voltage your card will need to keep performing, when you select this, it will force the voltage you give it and will in most cases just fail because the card doesn't get enough power.
Did you flash this card before?
A bad rom could cause this yes.