I'm still trying to get it to work as well as single gpu. I guess I like the tinkering more than actually playing :tongue:
What has helped the most is:
Disable Ulps in registery
Max power limit on each card
Pointing out that upgrading your gpu will get you minimal gains if trying to achieve high fps. Save your money long enough to afford a CPU upgrade. A used 6700k or r5 1600 for $220, mobo for $90, 16gb ram for $80 = $390.
I spent a few hours yesterday switching between 17.3.3 and 16.11.5 and making custom resolutions then trying crossfire with your settings and other settings.
Fps increased but was no where near as smooth as dx12 so it was a worse experience…