What AM4 CPU Should I Get to Upgrade from a 5600X for Gaming with a 4070?

Honestly, if you can find a used 5700X3D or 5800X3D, that could significantly boost your gaming performance. Those are pretty much your best options in the AM4 realm. Just be cautious about overpaying; some sellers might ask for too much, so shop around a bit.

The only real CPU upgrade path for gaming on AM4 is the 5700X3D or 5800X3D, but they're getting pricey and hard to find. I’d suggest waiting a bit unless you can snag one at a fair price.

Given the current prices for the higher-end AM4 chips, you might be better off waiting to save for an AM5 upgrade. The performance leap might be worth it in the long run.

Have you considered just upgrading your monitor? A decent 1440p display could help you fully utilize your GPU without needing to swap CPUs just yet. Plus, you could potentially optimize your 5600X with better cooling and slight overclocking, which might squeeze a bit more performance out of it.

If you want to stick with AM4, I'd say stay with your 5600X for now unless you spot a 5700X3D or 5800X3D at a decent price—around $400 max. Otherwise, it's hard to find anything that’ll give you a significant performance uplift without overspending.