I'm running a 34" Asus 4K (3840 x 2160) Pro-Art monitor on the second highest graphics preset and I cannot complain at the performance I get in MSFS2020 running i7-8700K, NVMe 1 TB, 16GB, 1TB game SSD, and a RTX2070. I wouldn't run Modern Warfare at that resolution but MSFS2020 seems to run pretty sweet. I don't think I could justify the significant extra amount of cash for the better graphics card.