I just bought a Samsung G9 Neo (5120x1440), and Ubuntu just worked resolution-wise. Had to switch the monitor to 120hz instead of 240 because otherwise Ubuntu would only allow 60. For the rest all is well. GTX1660Ti. I’m actively looking to upgrade that card now though, with an RTX4060Ti being the prime candidate. I wondered whether i should choose AMD instead, but the doubt was too much. 😅