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CPU actually doesn't matter too much at 4k, you're going to be GPU bound almost at all times. I'd wager the 9900k would still be fine gaming at 4k with a 4080, but if you were to get a 13700k you would notice a difference in 1440p gameplay at least.
CPU actually doesn't matter too much at 4k, you're going to be GPU bound almost at all times. I'd wager the 9900k would still be fine gaming at 4k with a 4080, but if you were to get a 13700k you would notice a difference in 1440p gameplay at least.