Benchmarks? As in multiple of them? Which benchmarks are those? These ones?
What's so special in these benchmarks compared to the average DX11 performance landscape?
Let's check:
- 980Ti is a bit faster than Fury X in both DX12 benchmarks and in DX11 on average
- 390 is a bit faster than 970 in both DX12 benchmarks and in DX11 on average
Unless I'm missing something it doesn't look like DX12 is changing anything in performance landscape of DX11. So this means that even these two DX12 benchmarks we have at the moment do not show any "better DX12 support" from AMD cards at all.
It's FUD in its purest form simply because you can't base such judgements on two benchmarks available at the moment. 970 and 390 are both good cards for 1080p, they are both likely to choke and die in 4K and will be hit and miss in 2560x... The choice is simple - if you feel like you need more RAM go with 390, if you prefer NV for some reason (PhysX I dunno) - go for 970. It's very unlikely that going with 390 over 970 you will get any DX12 benefits which won't be available to 970 and vice versa.