DDR4 frequency gaming benchmarks

Oct 14, 2018
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Hello there,
I'm looking for some gaming benchmarks regarding ddr4 frequencys from 2133 up to 4000 (or closer) and their impact on fps.
As far as I've seen the diffrerence is noticeable on ryzen 7 but i have no data yet for Intel processors, also there seems to be diminishing returns above 3200mhz (correct me if i'm wrong).
Is there any reliable benchmark on both Brand processors? I'm looking to buying a new 2x8 kit and still unsure about speed, prolly 3000 / 3200 but i'd like real performance difference on games vs asking price.

Kind regards.