Issues with 128gb of Ram, ASRock Rack X570D4U, and Ryzen 7 3800X

[DriedSponge]

Hello there,

 

I have a home server that uses a ASRock Rack X570D4U, and it runs pretty well with 64gb (2x 32gb) of DDR4-3200 memory and a Ryzen 7 3800X. Today I tried to add an additional 64gb of ram (two more 32gb sticks, totaling to 128gb) but upon starting my system, I found it to be incredibly slow, and very buggy. I would run into issues where I could not SSH into the system, and my docker containers were straight up refusing to work. For reference, I'm running Ubuntu  Server 22.04.3 LTS.

 

The memory sticks I am using are the Crucial CT32G4DFD832A (amazon link for more information). They are listed on the X570D4U spec sheet as supported modules, and worked just fine in a 2x32gb configuration. I am experiencing  issues when using 4x32gb (each stick is the exact same model).

 

I'm wondering if there is a compatibility issue I'm not seeing, or a bios setting I need to change in order to get this to work. It's not a dire situation because I can still refund the memory to amazon, but I would still like to try to get it to work.

For additional information, here is the DRAM max frequency chart, I have no clue how to read it but maybe it might clue someone in on what could be happening.

Also I noticed here the after installing the ram, the speed dropped from 3200 to 2666. I tried changing it back to 3200 manually but the system would not post so I reset the bios to 2666.

Any help or insight is very much appreciated! Thank you!

[Shimejii]

This has been a thing for nearly a decade at this point. 4 Dimms on a consumer platform do not run at higher speeds then usually a little over the minimum spec and pretty much never have . It even says on the sheet 2666 max frequency. Not sure what you are misunderstanding about the graph.

 

SR = Single Rank Dimm. DR = Dual Rank Dimm. 

 

Generally 2 Dimms (2x32) is the way to go if you want speed, and 4x32 if you need capacity. You do not get to have both speed and capacity at that point.

[DriedSponge]

9 minutes ago, Shimejii said:

This has been a thing for nearly a decade at this point. 4 Dimms on a consumer platform do not run at higher speeds then usually a little over the minimum spec and pretty much never have . It even says on the sheet 2666 max frequency. Not sure what you are misunderstanding about the graph.

 

SR = Single Rank Dimm. DR = Dual Rank Dimm. 

 

Generally 2 Dimms (2x32) is the way to go if you want speed, and 4x32 if you need capacity. You do not get to have both speed and capacity at that point.

Yeah that's what I figured, thanks for clarifying. I'm more confused about the terms at the top of the chart (Picasso, Matisse, Renoir, Vermeer), I'm not sure what they mean and which one my build falls under.

[Shimejii]

7 minutes ago, DriedSponge said:

Yeah that's what I figured, thanks for clarifying. I'm more confused about the terms at the top of the chart (Picasso, Matisse, Renoir, Vermeer), I'm not sure what they mean and which one my build falls under.

That is the ryzen code names Picasso = 2nd Gen Ryzen Apus, Matisse =  3rd Gen ryzen aka what you are using, Renoir = 4000 Series mobile, Vermeer = 4th Gen ryzen (5000 series)

[DriedSponge]

1 minute ago, Shimejii said:

That is the ryzen code names Picasso = 2nd Gen Ryzen Apus, Matisse =  3rd Gen ryzen aka what you are using, Renoir = 4000 Series mobile, Vermeer = 4th Gen ryzen (5000 series)

That's good information to know, thank you. I would assume that even running at a speed of 2666, the system should still be stable? It seems weird to me that a drop from 3200 to 2666 would cause such a disruption on my server.

[LIGISTX]

4 minutes ago, DriedSponge said:

That's good information to know, thank you. I would assume that even running at a speed of 2666, the system should still be stable? It seems weird to me that a drop from 3200 to 2666 would cause such a disruption on my server.

RAM speed on a home server likely would never be noticable... so that is definitely not the issue.

 

I would potentially run some memory tests like memtest or something similar. Make sure the sticks are all good, and potentially update BIOS.

[DriedSponge]

20 hours ago, LIGISTX said:

RAM speed on a home server likely would never be noticable... so that is definitely not the issue.

 

I would potentially run some memory tests like memtest or something similar. Make sure the sticks are all good, and potentially update BIOS.

I ran memtest86 on the two new sticks today and found no issues. I might just return the two modules back to amazon and stick with 64gb at 3200 speed only because I don't really need 128gb (I was just future proofing) and this issue has taken up way too much of my time. Thanks for the help!