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Those cards/motherboards all have DP 1.2 inputs, max 4K @ 60 Hz. The problem is there is currently zero ways to get the output of say a Titan-XP to switch over to Thunderbolt 3 for 4K @ 120 Hz.
I'm pretty sure this Dell would have used this Sony panel:
https://pro.sony.com/bbsc/ssr/cat-hdr/cat-hdr1/product-BVMX300/
That's a $20,000 pro monitor. The cost of course would be driven down by significant volume increase with the Dell.
I think Dell could pull a profit at $5,000. It would absolutely destroy every other monitor out there and people like me would pay for that. The real problem was Thunderbolt only for 4K 120 Hz. They could have shelved the monitor until DP 1.3/1.4 TCons come available sometime this millennia.
You are working on some old information there. These Sony OLED's are the creme of the crop professional master monitors. IPS is a joke. OLED has great viewing angles and with no inane IPS glow. Not to mention ~1000:1 contrast ratio of IPS is laughable.
Burn in is a zero issue with modern OLEDs, only slight temporary image retention. LG's white OLED's have tremendous life-span, even greater than a lot LCD's.
http://www.flatpanelshd.com/news.php?subaction=showfull&id=1465304750