If you have no compatibility issues with Cross Fire:
Two RX-480s in CrossFire for $400-500 w/ only 300w max TDP,

I'd switch to that in a heartbeat, cuz My lightnings pull stupid amounts of power in Xfire mode when both are maxed to the point my APC Beeps that it's overloaded and it's a 1000w UPS/APC, I had to install a Second PSU, To feed the 2nd Card and Plug that into a Separate UPS to keep them from Overloading when playing in XFire Mode.

So drop a fair amount of Power Consumption and heat while getting a Performance Boost Per GPU I'll take it.

with DX12 EMA, No need to continue Xfire Drivers, support the DX9/11 XFire Modes, but DX12 EMA is legit, neighbor was running a R9-280X and a nVidia 970 with crazy good performance,.

Im Looking forward to Split Screen Rendering, so each GPU does a Single Eye.