Then a 5800X3D is maybe what you need.
AMD’s 3D cache is demonstrated to compensate for slower RAM. Tightened timings or lower bandwidth have proportionally less of an impact than non X3D CPUs because, in games, they are accessing RAM less, as more of it fits in cache. You can look up benchmarks proving this if you don’t believe me, or how the 5800X3D smacks 7000 series AM5 CPUs around in CPU-heavy simulation games.
It’s better than low-end AM5.
That, and the actual latency of high end DDR4 isn’t that different from DDR5.
Now. If you are encoding AV1? If you are trying to run llama.cpp hybrid inference? Yeah, raw RAM bandwidth starts to get important. But that niche does not include most games; games freaking love X3D cache.
…Though, honestly? On a Steam deck, or your desktop, RAM capacity and the 2060 are the big bottlenecks.
I used to game on a very similar system (laptop 4900HS CPU, 16GB DDR4, 2060 GPU), and my biggest problems in new games were:
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GPU power
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6GB RAM/16GB VRAM being too small, especially with background programs.
The only times my CPU felt insufficient was in games that wanted raw simulation performance, like modded Rimworld, Stellaris, Parkitect and such. But it was plenty for huge RPGs.
There was never a time I lamented “ugh, I wish I had DDR5.” It’s just low on the totem pole, especially now.