I'm getting 300-400h with intensity set that low. Yes, compute is turned on.
{ "id" : 0, "intensity" : 50, "worksize" : 16, "threads" : 2},
For all cards. It gives me 300-400h.
check compute mode
and use "intensity" : 58, "worksize" : 8
also this trouble possible if use afterburner and temp limit low