Does 16GB of RAM help 1% low FPS more than average FPS?

Yes, noticeably. For a Ryzen 5 5600X in Cyberpunk 2077, going from 8GB to 16GB won’t wildly change your max frame rate, but it’ll clean up the stutters and dips that make the game feel bad. 8GB is the bare minimum; Cyberpunk can use 10-12GB on its own, and running out of RAM causes slow SSD swapping that hits 1% lows hard. With 16GB, you have headroom, so 1% lows are higher and more stable — it’s the single cheapest upgrade to smooth out the experience.