Need a hand Troubleshooting why my DDR5 6400 RAM is failing to initialize the boot sequence…

[mathscasual]

Build:

• ASUS ROG CROSSHAIR X670E HERO
• AMD Ryzen 9 7950X
• 128 GB G.SKILL Trident Z5 RGB Series DDR5 RAM 6400
• NVIDIA RTX A4000 16GB
• EVGA SuperNOVA 1000 GT

I get an error Q-code on boot, pre-bios, of ‘0d’. Then it fails to boot.

One or Two Sticks(either set), it boots fine and I’m up and running.

When I boot with Four the first time from Two, it boots fine, the problem is when I restart it, it gives me an error code.

I am wondering, is it compatibility?

Is it because the ram are XMP optimized and not EXPO?

I‘ve lowered the rate to 2400 for proof of concept that there isn’t an overload of some sort.

What do you think I should do in terms of adjustments to the BIOS, is 1000W enough, should I replace them?

[nx2l]

4 dimms requires lower speeds.

Can try to go for 4600 or 4400 on the fast end.

Some have to dial back to 3600 to get stable.

[mathscasual]

I’ve tried 4800, 3600, 2400. same error.

[nx2l]

clear cmos && update bios and try again?

[mathscasual]

It booted to this screen after about 5 minutes at Qcode ‘15’(guessing calibration of memory)

Then entered bios, save and reset, code ‘0d’

Removed two sticks, set the frequency to 3200 added the other two, reset the CMOS and it worked(detecting 128Gb ram, so as proof of concept I shut it down and restarted.

Then death once again, ‘0d’.

[nx2l]

Thinking either…

the MB is iffy
the cpu imc is poor
the MB doesnt like that RAM

Is that RAM part number on the QVL for that motherboard?

[mathscasual]

It seems that clearing the CMOS and resetting the Bios(which the only thing changed was specifically the frequency) has it working. So having the frequency to auto, vs a specific setting. Hopefully it stays this way.