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AMD Ryzen 5000 CPUs Gaming Perf Improves by 5-10% on Switching to 4 Memory DIMMs vs 2

Gamersnexus has made some interesting observations with respect to the Ryzen 5000 memory configuration. Generally, when talking about performance, we consider the memory speed and timings, plus whether you’re using single-channel or dual-channel memory.

GameShadow of the Tomb RaiderF1 2020Total War #1Total War #2The Div 2GTA VRDR 2
Perf Gain8.7%4.7%2.2%6.4%3.8%2%2.2%

However, in this case, Steve tested the Ryzen 5 5600X using four memory DIMMs vs two and got some interesting results. The gaming performance saw an increase of 5-10% across various titles, with Shadow of the Tomb Raider seeing the highest benefit at 8.7%.

Considering that the 5600X is a one CCX, we expect the gains to be higher with multi-chiplet CPUs such as the 5900X and 5950X. As for the reason behind this gain, I believe when using a 4-DIMM config, the two pairs act as a dual-rank channel. Although you’re still running in dual-channel mode, four DIMMs, like dual-rank memory, you have a higher number of open rows (pages), increasing the hit rate and therefore reducing the chance of a flush. More on that here.

This image has an empty alt attribute; its file name is Spatial-organization-of-memory-into-channels-ranks-banks-rows-and-columns-a-When.png

Considering that AMD’s processors have a lower memory bandwidth and higher latency compared to Intel processors, they’re less likely to get penalized upon switching between the different ranks (here DIMMs). Keep in mind that this is just speculation on my part, and I could be wrong.

Areej

Computer Engineering dropout (3 years), writer, journalist, and amateur poet. I started Techquila while in college to address my hardware passion. Although largely successful, it suffered from many internal weaknesses. Left and now working on Hardware Times, a site purely dedicated to.Processor architectures and in-depth benchmarks. That's what we do here at Hardware Times!

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