Try this one

https://drive.google.com/open?id=1buFOCC3j87tw5U5809KLqxQUQPflHuiQ

It's 1200/2000, not so hard on undervolting, it seems not to have those strange clock issues in Windows.

It gives me 29+ MH/s on ETH.

As I said I'm not unhappy with performance, but power consumption optimization.

The card is more than stable @ 1100 core and 900 mv or less. No problem in Linux, but Windows drivers somehow mess up with clocks with this undervolting.