AMD RX 550 (affordable GPU) comes with support for 4K 60 hertz. If this resolution and FPS is enough for you, you may want to consider purchasing this GPU. But I don't know if there is an AMD GPU with 4K 144 hertz support. I would highly recommend a new generation nVidia GPU for such high monitors. For someone who already owns this kind of expensive monitor, I think purchasing a good nVidia GPU won't be too difficult.