DX12 MultiGPU - SFR Question

Sooo.

I have read some articles about DX12 Split Frame Rendering for Multi GPUs in the recent days.
For anyone who doesn't know what Split Frame Rendering is a quick compare to Alternate Frame Rendering which is mostly used today:

I know that in DX10 and DX11 you have to specially program in the SLI and Crossfire Support to really gain form it.

I searched but nowhere I could find an answer to this Question:

Do we have to specially program support for SFR in or does DX12 do the Job automatically when more than one GPU is detected?

I hope someone knows a bit more.

Please excuse my broken grammar.
German is my first language

 

Maybe the screen spilt into many parts(tile) and each gpu draw the one part then all parts combine togather.

 

And aren't AMD bringing out a VR GPU which is two Fury X cards packed into one board.

This could be amazing for VR.

I would guess that it is a feature that Unity will need to include either under the hood or as an option.

 

As far as I know the SFR is only part of the explicit multi adapter. So it is all on the devs.