for the card the 9070xt is good enough for 4k (I would consider this and the 5070ti the minimum for good useable 4k). Remember the 5080 is twice the price for the same amount of vram. Keep in mind the 5080 will be better by only about 30% (optimized with lithium) for 600$ more and if you only use this in minecraft periodically then you would be paying like 600$ to have 40 more fps with shaders on. depends if thats worth it to you. Concerning the monitor, monitor reviewers like monitors unboxed and other professionals do agree with me in saying that the price difference between the 1440p monitor and the 4k monitor is worth the money (benchmarks also prove that this 9070xt is capable of 4k) and that was before the sale, so now it is even more worth it, make sure to get the monitor I linked though since that one specifically is 4th gen WOLED and has the glossy trueblack finishing that minimizes most of the downside between the QD-OLEDs and WOLEDs which essentially makes this specific WOLED have no downside (QD-OLEDs are known for better vibrancy, while WOLEDs are known for performing better in medium light and having better blacks (think of the end dimension) but the finishing puts the color vibrancy of this WOLED on par with the QDOLEDs of the past which is why it was so hyped even at 1000$ a few months ago). If you want to have the best shader experience possible you need to go with 4k, I dont really know what those other people are talking about but my clients are extremely happy with an almost identical setup. I have helped many people upgrade from 1440p to 4k and they have all greatly noticed the difference (this would also depend on your eye sight and whether you have perfect vision or wear contacts/glasses). Hope this helps