AMD Ryzen 7 2700X is a great processor for 4K gaming, as there is not a lot of load on the processor at high resolutions. For 4K gaming, you should use RTX 2080, Radeon RX 6800, or a better graphics card. However, it is not a suitable processor for high-refresh-rate gaming, as its single-core performance is not comparable to the latest processors. For a 165-Hz or 240-Hz monitor, it would be better to upgrade the processor to Ryzen 5 5600X, etc.