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Comment by garkin | Hacker News Reader

2400 vs 3000 vs 3200 MHz RAM | Ryzen 2nd gen: https://youtu.be/TjMq-Nv6Mq8

It affects general tasks too, but with much less magnitude than gaming, because games are concerned with frame times and overall latency the most.

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Well, sure... but doesn't increasing the RAM clock increase the throughput as well?

What I'm asking is, is there a good way to test the effects of just memory latency?

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).

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.

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...

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