X670E TAICHI RAM Issue

ok an update: after I got a new board, I tested everything (really everything) again.

Used a different power supply (Corsair TX 650).
Disconnected all consumers (SSDs, NVME) etc.
CMOS reset again

Here it comes:

With a placement of the two modules (2x 16GB) on B2 and B1 it works even with everything (all periphery) connected.

What do you think?
Does there seem to be an incompatibility of the EXPO modules? If so, should I have to open an RMA request... or will a future BIOS Update help here?

ehcbaer wrote: hello all, Trident Z5 F5-6000J3038F16GX2-TZ5NR (actually 2x)

So, two kits of two? As has been said, bad idea with DDR5, better get two bigger modules instead of four smaller ones. Plus, 64 GB is only necessary if you use special professional software or workloads that need >32 GB. Otherwise, there is no benefit from just having that much RAM, you'd just make things more difficult for your memory system. The only benefit comes when you have something that actually utilizes that much RAM.

ehcbaer wrote: The system does not boot up with double RAM. Originally it even worked for 2 weeks.

This is weird.

ehcbaer wrote: no solution so far. So I have to use only one RAM bar in B2.

It doesn't even want to work with two modules in A2+B2 now? There is some kind of deterioration in the system. You could check the socket for any bent pins. Now that AMD also uses an LGA socket, the pins are equally as fragile as on Intel, and a lot of them direcly connect to the RAM slot contacts.

What is your PSU (model and age) and what's your CPU cooler?

I also have same issue with x670e steel legend, 7950x and 4 modules 32GB Samsung M323R4GA3BB0-CQKOD(DDR5 PC5-38400).
With 2 modules i can run with bus 6000c36 easily but with 4 modules i can only get bus 3600
Now i am using latest bios version with 1.14.AS06 Beta

Yes, that comes on top of that. You are an early adopter of a brand new platform, which is also AMD's first foray into DDR5 technology. From what i hear, it's not the total catastrophy that it was with the first Ryzen generation where people were having issues left and right and begging for new BIOS updates to solve the most annoying things. But you can't expect smooth sailing either for the first weeks and months.

There are just the first early adopters reporting back to the board manufacturers about BIOS issues and lack of RAM optimization, so the improvements based on user feedback are just slowly picking up some steam. With any totally new platform, you will see rather big improvements being made in the first couple BIOS updates.

However, even on Intel 600-series, there still are issues with XMP support once you get to DDR5-6000 (and certainly above), as well as being restricted to lower frequencies when using four modules. The Z690 boards have almost a year of BIOS updates under their belt, but some fundamental limitations about the early DDR5 technology obviously cannot be solved completely.

Anyway, if you expect zero problems, then you can't be an early adopter, you have to wait at least a few months for the first few BIOS updates to have ironed out the worst annoyances. If you want the latest and greatest tech right after it was released, you're gonna have some "bananaware" that slowly ripens over time.

And i'm not even sure they can ever get DDR5-6000+ working flawlessly with four high-capacity dual-rank modules. This might be too much to ask for the first generation DDR5 solutions.

Four modules don't run well at all with DDR5, that's how it is on Intel at least, where we have the most experience with it. I explain this in detail in my RAM thread (see signature) under 2).

With AMD AM5 boards and 7000-series CPUs, there are almost no empirical values apart from reviews, and user reports are just starting to hopefully come in from people like you trying it.

The first sign that four modules is not advised with DDR5 is that there are no four-module RAM kits available at all, and that's for a reason. Once you use four modules with a DDR5 board (also from other brands), the maximum frequency that the memory system can reach drops down considerably. With four dual-rank 32 GB modules such like yours, there is a huge drop in the attainable frequency, because the signal quality seems to suffer dramatically.

They might be able to improve the situation somewhat with a new BIOS, but not substantially. I would say that with the current generation of DDR5 board designs, with four modules, it's more likely that the frequency you can reach will stay quite low. With DDR5 it's always highly advised to use two modules only (and even with DDR4 that is advised, but four modules can at least work decently there).

DDR4 is actually better for high-capacity/high-density memory configurations, because:
- It doesn't experience such a drop in the electrical properties of the memory system when using four modules
- Big DDR4 modules and kits of four are readily available for a much lower price
- Four-module kits are actually certified on the QVL at MSI
- They will most likely outperform their DDR5 equivalent due to DDR4's lower latencies, when compared to DDR5's necessary low required frequencies at this configuration.
This is because the overall higher DDR5 latencies can't be compensated for by higher RAM frequencies anymore, because using four DDR5 modules requires lower frequencies to be stable.

As for the RAM performance scaling, read here, https://www.techpowerup.com/review/ddr5-memory-performance-scaling/

So, the board specification is not to be taken lightly. Even looking at two modules only, DDR5-6200/6400 kits are really causing some problems on boards with four RAM slots. That's on the upper end of what the signal quality currently allows for on DDR5, unless you pump in ungodly amounts of voltage or use other tricks that are not the best for a daily system. Watch this spot in the video here where an experienced RAM overclocker talks about that issue: https://www.youtube.com/watch?v=alk3QLyQebs&t=238s.

And then there's the video DDR5 motherboards should come with only 2 dimm slots as standard (Youtube)

DDR5-6400 and higher might only work properly on boards with two RAM slots, because the signal quality is better there than a four-slot board with two empty slots. And it also depends on the CPU's IMC (memory controller). But with four modules, you cannot dream to get anywhere near such RAM frequencies, you are lucky when it runs stable at a lower frequency somewhere in the DDR5-4800 range or so.