At 1440p the Core i5-10600K keeps up with graphics cards up to the RTX 5070 or the Radeon RX 7900 GRE; a faster card shows its extra speed only at 4K. For 1080p, up to the RTX 4060 or the Radeon RX 7600 XT.
Which current graphics cards the Intel Core i5-10600K can keep fully used, in a typical game at high settings. A card faster than the group you play at waits for the processor, so the card that makes the most of the Core i5-10600K is the fastest in that group. Listed fastest first; each links to the full result for the pair.
The fastest older graphics cards the Core i5-10600K keeps fully used at 1440p:
The Core i5-10600K and each graphics card are compared at each resolution with the same model and reference data as the bottleneck calculator, which the Bottleneck app uses to judge the hardware it measures. It is an estimate for a typical game at high settings: strategy, simulation and large multiplayer games lean on the processor more, and so do lower settings and upscaling. Price is not part of it.
A Core i5-10600K can fall short of its own figure: memory speed, heat and power settings decide what it delivers. Bottleneck checks the usual reasons a PC falls short of its parts, free: memory below its rated speed or in single channel, Resizable BAR and GPU scheduling left off, a monitor held at 60 Hz, heat. Then, while you play, it records which part set the pace in every frame.
The free version has no time limit and needs no account. Pro, $9 once, explains each problem and how to fix it, makes the common fixes in one click, and costs out the upgrade for your own PC. Compare the versions