I have a watercooled R9 290x2 I am trying to mine with. The hash rate starts out good at about 300/h per core, however after about 5 or 10 minutes one core slows to half.
I tried drivers 15.12 16.3.2 and 16.12.2
None of the drivers changed the issue. GPU-z does not show temp or clock info for some reason. Tried with all 3 drivers.
Tried hashing out power limit and -tt with no change.