Trident Z XMP

[Skiller]

Hi,

Recently updated my old AM4 with 5700x3d, and got a few years old 32gb trident z kit for free from a friend. Turns out it is is a Samsung B-die kit apparently, and should be fairly unused. (F4-4000C19D-32GTZR) The motherboard is MSI x470 Gaming Pro Max.

Problem:
I am not able to run the kit anywhere near the rated 4000MT/s. The highest i have gotten is 3600 with 1:1:1. Zen timings:



The above is stable, with testmem5 extreme anta777 for a few hours at least. I cannot get the timings any tighter, 16-16-16-36 1T+GDMon does boot but have not tested for stability. 15-15-15-35 2T does not boot even with 1.45 VDIMM, and the XMP is rated 1.35V.

The current settings are ok, and are already enough for the processor... but I would like to understand why i am not able to reach the 4000 MT/s speed. If I decouple the IF the kit will still not let me run the 19-19-19-39 timings even with 1.45 VDIMM.

I am starting to suspect that the reason is the motherboard, and some incorrect subtimings.... or just a simple wall that the CPU/x470 is not able to run these 2R DIMMs any faster. Is anyone here able to advice on how to set them up? The above are set with dram calculator 1.73 but it does not support b-die at 4000.

Thank you for any advice you would be able to give.

[emissary42]

A Zen3 CPU like the 5700X3D should be able to run at least 3733/3800 synced. So if you are stuck at 3600 even with a manual memory OC (don't use the calculator for that), you are probably held back by the motherboard. Many B550/X570 motherboards should be able to max out the CPUs capabilities memory wise. Hitting DDR4-4000 sync at all and not getting WHEA errors is super rare though, unless you get an APU. The monolithic designs have a higher threshold for that.

[Skiller]

Hi,
Thank you for the reply.

I did some testing by putting each DIMM individually into slot A2. Below are the settings used in the tests. I ran testmem5 extreme anta777 2h for each stick and they seem stable.

1. Decoupled the FLCK and ULCK from the MLCK to only test the memory. All memory timings were left on AUTO (Primaries were set manually at 19-19-19-39. 1.4V)
2. Found the highest frequency I was able to post at (3866 for DIMM1 and 3800 for DIMM2)
3. Increased voltage to 1.45 and tightened timings until I arrived to 15-15-15-35.
4. Ran stability tests

Interestingly, if I was able to post and load windows, there were no errors detected in any tests. DIMM1 would be rock stable 15-15-15-35 3866 1.45v but would not post 19-19-19-39 3900 1.45. Both modules behaved in a similar way.

My hypothesis at this point would be that the motherboard is holding me back. I have not tried how high the FLCK can be pushed, that would be the next test. I just wanted to know if the memory kit is fine, and it would seem that it is fine and even quite decent. If I want there is a chance to repurpose a MSI B550 MAG Tomahawk motherboard which would hopefully fare better in regards to memory, and would also have a PCIe4 slot for a future upgrade on the GPU.

Do you think I could push the memory further with the motherboard above?

[emissary42]

Before you even think about upgrading the motherboard, figure out if your CPU can run 3800/3866 synced without WHEA. There probably are tutorials about how to test that on YouTube and overclocking related forums. An async setup (esp. at low freq) is not worth it performance wise, since the latency takes a huge hit.

Usually with a X3D processor, the impact of higher memory frequencies in many use cases is not that big. So maybe just try to get the most out of the hardware you got. Secondary timings like tRFC etc have lots of room to tweak still. Being able to run many timings really tight is one of the big advantages of a decent S8B based kit like that after all.

[Skiller]

Hi,

Decoupled I am able to push the infinity fabric to 1866 but 1900 wont boot. 1933-2000 will boot funnily enough, but create lots of WHEA errors. I think my CPU limit is at 1866 or 1800mhz. (3600MTs - 3733MTs). SOC was 1.15 at 1866. 1.15V.

All this is fine, since as you pointed out the faster memory does not have too much of an impact especially in games with this CPU. What i would still want to have are tighter timigs. With both DIMMs installed I max out at 3600MTs 16-16-16-36. higher SOC or VDIMM does not help to bring the timings lower, or frequency higher. As per the previous post I know the memory can go at least 3733MTs 15-15-15-35.

From 3600 16-16-16-36 to 3733MTs 15-15-15-35. would be a small boost in certain workloads but I don.t think it would be drastic. The upgrade would then just mainly allow for a GPU upgrade down the line.