AMD Ryzen RAM scaling - performance effect in games

Memory (DDR4/DDR5) and Storage (SSD/NVMe) 368 Page 3 of 9 Published by

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Hardware and Software used

Hardware and Software used

Mainboard

  • Aorus X470 Gaming 7 WIFI

Processor

  • AMD Ryzen 7 3700X
 

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 Graphics Cards

  • Gigabyte GeForce RTX 2080 Ti 11G

Memory

CPU cooler

  • Asus Ryujin 360 (AMD system)

Power Supply Unit

  • Seasonic Prime Titanium Ultra 850 W

Mass storage

  • Samsung 970 Evo 1 TB, OCZ RD400 512 GB

 Monitor

  • AOC AG271QG up to 2560 x 1440

OS related Software

  • Windows 10 (latest patches & updates installed) 
  • DirectX 9/10/11/12 latest End-User Runtime  (Download)
  • Nvidia GeForce driver latest (Download)

We ran the games at FullHD (1920 x 1080) resolution and Highest details (yes, the 2080 Ti is not a weak card). We used RTSS to measure the number of frames per second (average fps) and the minimum fps. The results presented in the graphs are the averages of the values obtained in 3 runs. We’ve tested the RAM versus game performance in the following configurations:

  • 3200 MHz CL14-14-14-34
  • 3200 MHz CL16-18-18-38
  • 3600 MHz CL14-16-16-36
  • 3600 MHz CL16-18-18-38
  • 3600 MHz CL18-20-20-40
  • 3733 MHz CL16-18-18-38
  • 3800 MHz CL17-19-19-39
  • 4000 MHz CL18-20-20-40
We've checked the impact of the Command Rate when the 1T/2T were used (the frequency was 3200 MHz CL14-14-14-34). There's a separate page for 3600/3733 MHz comparison (with CL16-18-18-38). Additionally, we’ve tested the 4 x 8GB in the following scenarios, to check the performance gain when using four DIMMs:
  • 3200 MHz CL14-14-14-34
Additionally, we've used the Crucial Ballistix Gaming 3200 MHz 4 x 16 GB to check the impact of using the Double Rank vs Single Rank memory.

Please make note of this: In Ryzen 3000 systems, as soon as you go higher than DDR4-3733, a 2:1 multiplier kicks in, and Infinity Fabric starts working at half the memory clock’s frequency. The 2:1 multiplier switches on at DDR4-3733 (but you can set it manually to 1:1), so do keep in mind that this will affect the speed at which the various core complexes within the CPU can communicate with each other. So, for the best overall system performance/stability compromise, we normally recommend a max frequency at DDR4-3600, then againw e never have seen an issue there performance-wise either. Let’s head to the practical part then.

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