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Matt Bach (Senior Puget Labs Technician)

2nd Gen AMD Ryzen Supported RAM Speeds

Written on June 6, 2018 by Matt Bach

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

Man oh man, DDR4-1866, haven't see those numbers since DDR3 days.

Posted on 2018-06-11 04:38:11
whispering malarkey

While amusing to look at, that figure is probably intended for the intersection of the worst DDR4 sticks combined with the lowest quality Ryzen memory controller. Testing last year showed that 2666 was achievable in a 64 GB configuration, though it was via Samsung B-die modules. After a year and revisions with CPU, motherboards, and RAM, at least 2400 should be realistic in most cases I suspect. I wouldn't be surprised to hear that 64 GB of average quality dual rank memory could perform at 2666 now. G-Skill's Flare X line can run 64 GB at 3200 CL14, but it costs just shy of $1000.

Posted on 2018-07-17 18:09:27
Niko Nikolov

Well this is a chicken answer from AMD as they dont want to take a risk.But the truth is that you can set a humble xmp profile of your 2 sticks or 4 sticks set to 3000 or 3200 as its a realistic number and it will be rock solid performance.Danger comes when you go with more ram and over the 3400 line.

Ram quality matters like for example people tend to search for samsung b dies chip in the sticks but most gskill trident z series are of ace quality.Having 32 gb set to 3000 or 3200 is a realistic number.Or 64gb set to 2800 or 3000 just as well.For 128gb i woud stay at 2666 just in case.

Posted on 2018-07-12 00:53:47

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