Well there may be games/scenarios where you'd benefit from the higher clocks on the 3900x but not sure what those would be, GPUs do all the heavy lifting. If a game is just pretty that's all GPU, CPU is needed if there's some complex calculations going on, like strategy games and the like. For most games even the 3700x is overkill. If spending the extra couple hundred is a non-issue I guess go for it, you'll get the comfort of knowing you've made no compromises. I guess in that case also upgrade to a 2080 Ti.