It seems to me like there’s a lot of factors to consider there without a clear obvious choice for the best one. One major factor would be compatibility. Which way works for the most people with the least support headache? 90Hz native has been problematic on the 8KX, and I’m sure Pimax doesn’t want a repeat of those kinds of issues.
The other biggest consideration of the choice would be the 40 series nVidia cards. Just how powerful will they really be? If you were only considering 30 series cards, I think single DP1.4 is probably the obvious choice. But maybe the 40s can drive enough pixel rate that a single DP1.4 would be a significant bottleneck (versus oversampling). But even if they can, how available are they going to be? And really needing dual DP1.4’s would probably only be a factor for the top end cards in the line which are going to be very expensive and also require whoppingly big power supplies and cooling.
Pimax really needs their new Reality series to have significant market penetration in order to support game developers adopting it and not just for a very narrow market of customers who have the most expensive and hard to get hardware. But they’ll also want the 12K to be the “go to” premier VR headset for that top end, too.
And then there’s DP2.0. That’s expected to appear on the 40 series cards. And it could run as DP1.4 on 30 series cards. That could be a great choice since the 30 series cards don’t push enough pixels to really need dual DP1.4 anyway. And the only GPUs that would be able to push so many pixels also have DP2.0 capability. But the availability and maturity of DP2.0 hardware to put into the 12K might be a problem.
That seems like a lot to consider. And a lot of it requires difficult predictions of the future. It would make sense for Pimax to delay the final decision as long as they can because that future gets easier to predict as it gets closer. Especially revelations about the 40 series.