Arktek have tried hard with me, I feel, to solve this problem [UBS/Thunderbolt3>single link DVI Adapter to link my old 23" Apple Cinema Display]. Artek are now on the point of doing a 4096x2160 USB/Thunderbolt3>DVI adapter and they sent me one [v quickly indeed] to try.
Unfortunately, with my old Apple 23" Cinema Display [Aluminum] which is single-link [I think and unlike the similar Apple 30" dual-link Display] this works no better/less fuzzily than Arktek's 1920x1200 Adapter. So that means both their current and new adapter do "work" but not clearly enough for me to do spreadsheets etc - and quite unlike the clarity of screen-image I get with my 2012 MacBook Thunderbolt>DVI Apple Adapter.
None of the other USB/Thunderbolt3>DVI adapters I've tried [Starteck, Cable Creation, Camac, Plugable] work at all or only flicker v fast - and Kanex, Glaxio etc don't bother to reply [via Amazon]
So the pain remains in my particular *ss.
Any suggestions of what WILL work and at the full 1920x1200 resolution .... yes PLEASE!