Question Why Isn't XMP/DCOP Working

[RS13]

I just built a new AM5 build 7900x with trident z 6400 ram and every time I turn on DCOP/XMP the system won't boot. I've switched motherboards and get the same result on both (first I had ASUS TUF Gaming B650 and now I have the ASRock 670 E Pro). Both are rated for that speed. So what's going on?


I've noticed that when I enable XMP the SoC/Uncore OC Voltage display 1.3 in red. I'm guessing that's the problem. But how do I fix it?

 

[Roland Of Gilead]

I just built a new AM5 build 7900x with trident z 6400 ram and every time I turn on DCOP/XMP the system won't boot. I've switched motherboards and get the same result on both (first I had ASUS TUF Gaming B650 and now I have the ASRock 670 E Pro). Both are rated for that speed. So what's going on?

Hey there,

So, chances are this i sjust some buggy stuff being worked out with the new platform. Make sure your bios is up to date as can be, particularly the AGESA updates. THey will bring mem compatibility, and bug fixes too.

I guess this is the price tp pay for early adopter for new release CPU/Mobo/Arch.

You can in the meantime, try set the DIMMS to run at their rated speeds manually. Note down the timings through CPU-z, or the sticker on the side of the DIMM. Input those timings and the voltage manually, and work your way up to the rated speed. Hopefully this will get you started, until the newest updates come out.

If you've just recently update your bios, make sure to clear CMOS afterwards so the bios takes correctly. If you did not do this, this could cause your DOCP issues.

List your full pc specs, including PSU/Case

 

[RS13]

Specs:
CPU: Ryzen 7900x
Ram: Trident z 6400 Mhz 16x2
GPU: RTX 3080
Mobo: ASRock 670 E Pro
PSU: ASUS ROG STRIX 1000W Gold psu
Storage: SK hynix Platinum P41 2TB and Corsair MP400 1 TB
Case: Antec DP503

Also, as I added in an edit above I've noticed that when I enable XMP the SoC/Uncore OC Voltage displays 1.3 in red.

 

[Karadjgne]

AM5 goes through memory training after a power dead scenario. Not a power off. So when booting for the first time after the psu is fully unplugged, like on a new build or change of equipment etc, it's going to take several minutes and likely several reboots as the cpu tests the ram to get optimal timings.

So you set DOCP, which sets the basic, generic settings, AM5 thinks it can do better, so tests the ram to find that optimal performance.

Which can take 5 minutes or more.

 

[gskill support]

Trident Z sounds like Intel XMP, and DDR5-6400 confirms it. That is not a validated combination so you can not expect it to run with XMP or at rated specifications. Set it lower to see what can be stable, or exchange for a memory kit listed on the G.Skill RAM Configurator for the motherboard:

https://www.gskill.com/configurator...524725289&chipset=1663552596&model=1663555692

 

[RS13]

That's super helpful. Noteworthy: ASRock lists that Ram at 6400 as compatible with their board. https://www.asrock.com/mb/AMD/X670E Pro RS/index.asp#Memory

 

[Karadjgne]

Intel has just recently brought out xmp 3.0 with faster than the 5600MHz native 13thGen speeds. So that's going to require ram that's compatible with the Intel xmp 3.0 system.

The Ryzen 7000 series, AM5, doesn't use standardized jadec tables the same way, it has Expo that undergoes memory training and changes the timings according to what's optimal for the pc. So it's not going to need the same level of optimization or compatibility that Intel setups will.

That's why it's Intel XMP optimized, and shouldn't be an issue with AMD. Kinda the exact opposite from what Intel had and Zen, Zen+, Zen2 went through.

So anything higher than 6000MHz is most likely going to say it's Intel XMP 3.0 optimized.

Which leaves either you aren't allowing sufficient time for the memory training to actually happen, or there is a different issue altogether. Possibly with the gpu/mobo

View: https://youtu.be/L8OH5cTnZbg