Thanks!M1 Pro, Max, and Ultra can do it. I was under the impression you were asking about the regular M1 and M2, both of which can't.
Two more questions tho ;-)
1. So that ain't right for base M1 then ?
Maximum horizontal resolution = 6144 or 3072 HiDPI
Maximum vertical resolution = 3160 or 1580 HiDPI
I don't see much difference between 1580 and 1620... so technically that scaling should be doable on M1 base model.
2. With BetterDisplay one is able to achieve up to 99% of native resolution (low res) as HiDPI.
Woudn't it be better to run 99% of 5120x2160 as HIDPI ?
What is max to be possible for such monitor ?