FWIW, I'm successfully using the strix OC bios found in This Post
With it i can use MSI AB and create a curve that puts up to 1.2V to the core.
Power Limit and Temp Limit are disabled so you will need to be careful using it.
You will want to set a high fixed fan speed or an improved fan curve before you test it.
You will also need to reboot your computer after you flash the bios. It took me awhile to figure that one out.
The Freq vs Volt curve should be tweaked as well since it will pump 1.2V without changing it.
I've already improved my OC by +40 over what i had before and there is still room for more i think.