I’ve seen comparisons of the 32GB vs 16GB GPD Win4 and there’s about a 10-15% uplift in performance at the same TDP in a lot of games with the 32GB model.

So it can give an increase in performance, or at the least let you run at a slightly lower TDP for the same performance and a bit better battery life.

Of course this was the 6800U, hard to say if the effects are similar for Intel’s chipset or not.