When dual mining on my XFX 295x2, periodically my hashrate is very poor.

I'll go from hashing ~31mhash eth ~900mhash decred (per gpu) to ~8mhash eth ~200mhash decred and then return. GPU-Z unfortunately doesn't show me the vrm temps on my 295 so I'm not sure what they are hitting. In single mining mode, I can actually push these things to do ~33mhash and they never seem to stray from that number.

I was originally using the recommended driver which exhibited the problem. I have moved on to the 17.xx drivers as for some magical reason they have allowed me to reduce the power target on both my 295x2 and 290x and sustain slightly higher clocks.


I see this is a known issue, which 9.6 didn't resolve sadly.

Does anyone have a 295x2 that is not having this problem? Should I try a different bios that anyone is aware of? The 290x (reference) in the same chassis (on a different psu) does not ever run into this problem, but it's running a customized bios based on the 390x aside from the other obvious differences between the cards.