Cheapest GPU that runs two 4k monitors smoothly (anyone tried it on rx460/470 or similar?)

Hey guys,

Any suggestions on cheapest GPU that would run on a hack with two 4k monitors without any lag on latest OS? (no games are needed, i do web work, hence photoshop/sketch/adobe xd/visual studio)

I do currently have rx5700, but due to crypto boom i can sell it for like 1000eur... I.e. i see a listing of rx460 in the ads for like a 100, however would be ideal if anyone could reply, as maybe there's someone who has tried it :S Or any other suggestions on what gpu i should look into (i'm planning to buy imac m1 whenever it's released, hence this solution is temporary)

p.s. one monitor defo needs to connect via DP, whereas another one supports hdmi2.1 & DP,

Thanks for your time