Thr DP wiki will explain how DP works. Links posted above. The bandwidth of 1.2 gives 4k @ 75hz.
It’s not clear at all, it depends on how the renderer works, we know that it alternates frames, so if it only sends one side at a time you can do that at 165hz, matthew also said there were no bottleneck, so the Pimax team doesn’t agree with you either.
I just want to know if it comes with any degraded performance and what.
Well it seems clear to the the DP 1.2 standards & makes sense to min specs. But carry on.
Alternate frames is with Brainwarp enabled.
Dual 1440p input equals roughly 4k. DP 1.2 bandwidth for 4k is 75hz. So each display can run 1440p @ 75hz simultaneously or sequentially (Brainwarp) same deal.