Puget Systems print logo

https://www.pugetsystems.com

Read this article at https://www.pugetsystems.com/guides/1175
Matt Bach (Senior Puget Labs Technician)

2nd Gen AMD Ryzen Supported RAM Speeds

Written on June 6, 2018 by Matt Bach
Share:

While not widely known, the supported RAM speeds for AMD's original Ryzen CPUs varied based on a number of factors including the number of sticks you are using and whether the RAM was single or dual rank. This information was not listed on most specification pages, but was available in a few official posts including Tips for Building a Better AMD Ryzen System.

The newer 2nd Gen Ryzen CPUs also have many of the same RAM speed limitations, but unfortunately AMD only lists a "Max System Memory Speed: 2933MHz" on their CPU specification pages and, unlike the original Ryzen CPUs, there are no other public documents from AMD that list the various RAM speeds that are supported. However, we reached out to our contacts at AMD and they were able to send us the following chart showing the officially supported RAM configurations for the 2nd Gen AMD Ryzen desktop processors:

AMD Ryzen 2 supported RAM speed

In other words, for users that want to use four sticks of RAM, DDR4-1866 or DDR4-2133 is the fastest supported RAM speed depending on whether the RAM is single or dual ranked. If you only need to use two sticks of RAM, the supported speed varies between DDR4-2400 and DDR4-2933 depending on a wide range of factors including the memory rank, the total number of RAM slots on the motherboard, and the number of PCB layers your motherboard has.

One thing we do want to mention is that we also confirmed with AMD that using RAM that is outside this official specification will not void your warranty. This is simply AMD's recommendations based on what they know and have tested to be stable.

Tags: Ryzen 2, RAM, Memory
Panacea

Adding testimonial to the claims of whispering malarkey and Niko Nikolov, I recently built a Ryzen 2700X system with 2 stick of 16gb DDR4-3000mhz (dual-rank, necessarily) to arrive at 32gb. This RAM was selected from the motherboard manufacturer's QVL list as being qualified to run at this capacity and speed.* The BIOS translated the XMP to AMD-speak and that was all it took to run DDR4 at 3000mhz.

AMD is just being very conservative dealing with a current world where RAM is designed, tested (and probably tweaked/hacked), and marketed for the dominant paradigm, which isn't them.

* Aside: DDR4-3200mhz at 32gb is also present on the QVL list, albeit at higher latencies. I took the middle approach of balancing speed and latency.

Posted on 2018-07-20 21:52:41