will dx12 let you run 2 different cards of the same brand? it looks promising to have a 390x + 980 Ti, but will it allow his 7970 + a 390x?
anyway, what i'm getting at, even when you DO upgrade, if you're gonna be doing some dx12 gaming, may want to hold on to the 7970 to give yourself a boost.
I think a lot of people are going to disappoint themselves by confusing what DX12 CAN do with what it WILL do... DX12 opens up the possibilities to do a heck of a lot, however, to do any of it requires a LOT more work from developers and I just don't see them putting in the effort to exploit much of its capabilities.