You can manually increase the DRAM access latency in BIOS, leaving clock alone, and measure. It impacts throughput somewhat, but may be a little closer to an apples-to-apples comparison. I don't know that anyone has attempted to do this for video games on Zen 2 specifically (especially considering Zen 2 is only commercially available for the first time, like, today).

Here is a fresh Zen1 timings comparison from Reddit[1].

Most increase is between 3200cl14 vs 3200cl12. 12%. Difference between this two is almost purely a Latency.

Then compare 3200cl12 and 3600cl14 - 3%, marginally no increase. Almost no difference in latency, only throughput and IF.

Past 3200 RAM throughput and inter-core-communication (IF) has very little influence for Zen1 gaming. For Zen2 this scenario would differ in some ways but not too much.

[1]: https://www.reddit.com/r/Amd/comments/c9x8v7/2700x_memory_sc...

I think that linked list with randomly distributed nodes is a good benchmark. Each jump will be hit miss and cause load from RAM and you can't prefetch anything because next address depends on content of fetch. Performance of simple iteration of that linked list should correspond to random memory access performance.